Summer Event (Cruise)

The Summer Event turns ISEPS into a cruise-management game: guests come aboard, pay their ticket and spending in Plinkies, leave reviews that produce Stars, while the Artificial Sun generates Sun Output. Prestiging converts your progress into Circuits. Every value comes from the game data: 15 shop upgrades, 93 skills, 9 prestige upgrades and 50 Cruise Ship levels.

Key figures

From the Summer Event data.

Skills

▲ 1 main · 9 mastery

Shop upgrades

— Rooms → Solar Panels

Cruise Ship levels

▲ Final Reward

Prestige upgrades

— Circuits

The event currencies

Four resources, each with a precise role in the loop.

Resource	Role
Plinkies	The event's central currency — paid by guests (tickets + spending), spent everywhere: shop, skills, Artificial Sun, Cruise Ship. The cumulated total feeds the prestige gauge.
Stars	Produced by reviews and review replies; the overall rating multiplies Plinkies earned. Also gained offline (Night Staff upgrade).
SSun Output	Output of the Artificial Sun (banked continuously) — the target of several missions and upgrades (A.I Workers, Solar Panels).
Circuits	Prestige currency: cumulated Plinkies complete "fills" converted into Circuits on reset, spent on the 9 prestige upgrades.

Example

At the start, a guest arrives every 30 s and stays 40 s. They pay a 1-Plinkie ticket plus a spending roll between 1 and 2.5 Plinkies — with a 10% chance of a ×1.2 crit. Your Overall Rating (from reviews) multiplies the Plinkies you earn.

Starting constants

The base pace of the cruise, before any upgrade.

Constant	Base value
Guest arrives every (s)	30 s
Guest stays (s)	40 s
Ticket price (Plinkies)	1
Spending per guest (Plinkies)	1 – 2.5
Group size (min – max)	1 – 1 (+0.05/guest)
Plinkies crit (chance · mult)	10 % · ×1.2
Offline cap (s)	3600 s
Crystals per mission	5
Assistant bonus (Plinkies · Sun · timers)	×1.1 · ×1.1 · ×10

How to read

Each row is a starting constant read from the game code — before any upgrade. Example: "Offline cap" = 3,600 s means the event initially counts at most 1 hour of offline gains (upgradable later).

Artificial Sun — 4 affixes

The four Sun upgrade paths: base value, gain per level and cost.

Affix	Base value	Gain / level	Start cost	Cost exponent
SRSpawn Rate	0	+0.1	1	×1.11
LTLife Time	0.64	+0.06	5	×1.13
AFAttraction	0.22	+0.04	240	×1.3
SZSphere Size	0.1	+0.02	5000	×2

Example

Spawn Rate costs 1 Plinkie at first with a 1.11 cost exponent; Sphere Size starts at 5,000 Plinkies with an exponent of 2 (cost doubles every level). Each Spawn Rate level adds +0.1 to the base value of 0.

The shop — 15 upgrades

In-game name and text, effect, base cost, per-level bonus, type and required cruise level.

#	Upgrade	Effect	Base cost
1	Rooms Build more rooms on your cruise to house more guests	max guests additive +1/lvl · max 100	5 L≥0: ^1 +1000 · L≥2: ^1.6 +500 · L≥5: ^1.6 +100
2	Guest Leave Time something something	sec to time between guests subtractive +0.2/lvl · max 90	15 L≥0: ^1.6 +50
3	Guest Stay Time something something	sec to the time Guest stays subtractive +0.5/lvl · max 100	20 L≥0: ^1.6 +50
4	Spa Area Build and upgrade your spa area	maximum plinkies per guest exponential +0.1/lvl · max 250	5 L≥0: ^1.6 +100
5	Cinema Build and upgrade your cinema	minimum plinkies per guest exponential +0.1/lvl · max 250	200 L≥0: ^1.6 +100
6	Food Quality Get better groceries for your chefs	chance for better reviews additive +1/lvl · max 100 · Gate lvl 30	50 L≥0: ^1.2 +250 · L≥50: ^1.7 +1·10⁶
7	Customer support Will make reviews better than they look.	more stars per star from reviews exponential +0.1/lvl · max 100 · Gate lvl 30	1000 L≥0: ^1.6 +1·10⁴
8	A.I Workers Hire A.I bots to look after your sun at night	to Artificial Sun Output exponential +0.5/lvl · max 100 · Gate lvl 35	1000 L≥0: ^1.6 +1·10⁴
9	Room Size Get bigger rooms to house bigger groups of people.	increase to max group size exponential +0.1/lvl · max 100 · Gate lvl 40	1500 L≥0: ^1.6 +1·10⁴
10	Night Staff Having staff at night increases your stars	Stars gained while offline. exponential +0.05/lvl · max 100 · Gate lvl 50	1500 L≥0: ^1.6 +1·10⁴
11	Scientists Better scientists = less scientists = cheaper.	cost reduction to all sun affix upgrades. exponential +0.1/lvl · max 100 · Gate lvl 70	2000 L≥0: ^1.6 +1·10⁴
12	Sun Beds The better the sun, the more people in beds.	to plinkies gained for each upgrade in Sun Sphere Size. compounding +0.2/lvl · max 100 · Gate lvl 100	2000 L≥0: ^1.6 +1·10⁴
13	Casino Build a casino to get lucky plinkies from your guests	to plinkies per guest crit multiplier additive +0.1/lvl · max 100 · Gate lvl 100	2500 L≥0: ^1.6 +1·10⁴
14	Slot Machines Tamper with the slot machines	to plinkies per guest crit chance. additive +1/lvl · max 80 · Gate lvl 100	2500 L≥0: ^1.6 +1·10⁴
15	Solar Panels Convert your artifial sun to energy.	Artificial Sun Output (Multiplicative) compounding +1.02/lvl · max 100 · Gate lvl 120	10⁴ L≥0: ^1.6 +1·10⁴

How to read

"Rooms" row: +1 max guest per level (additive), base cost 5 Plinkies, 100 levels, available from the start (cruise gate 0). Its cost growth shifts twice: exponent 1 at level 0, then 1.6 from levels 2 and 5.

The skill tree — 93 skills

Base cost, levels, prerequisites and per-level bonuses (verbatim game text).

#	Skill	Base cost	Max lvl	Requires (#)	Bonuses per level
1	AI WORKER	5·10¹⁴	5	2, 86	+75% Particle Output
2	TESLA COIL	2.5·10¹⁴	6	5	+25% Particle Output
3	WATER MILL	6·10¹¹	5	7, 8	+12% Particle Output
4	HACKER	1.2·10¹⁴	6	11	+0.2 to Overall Star Rating multiplier
5	LAWYER	1.2·10¹⁴	5	11	/5 Particle Cost Reduction (compounding)
6	NIGHT STAFF	2·10¹²	4	13	+14% Particle Output Better Reviews
7	ROULETTE	9·10¹¹	5	3, 14	Adds 0.02x to Celebrity Mult Adds 0.02x to Plinkies Mult
8	TAX FREE MARKET	5·10¹¹	5	14, 3, 9	x1.05 Minimum Guest Spending (Compounding) x1.03 Maximum Guest Spending (Compounding)
9	PAY PHONES	7·10⁷	5	8, 10	Adds 0.04x to Plinkies Mult +4 Minimum Guest Spending
10	BETTER SUN SCIENTISTS	3.5·10⁷	18	9, 15	/1.3 Particle Cost Reduction +1 Minimum Guest Spending +80 Particle Output Per Sec (Isolated Additive)
11	PLASMA FUEL	10¹⁴	10	12, 16	-0.5% Guest Checkout Time -0.5% Guest Arrive Time
12	ROOMS	2·10⁹	28	11, 17	+3 Rooms
13	PADDLE COURT	2·10¹¹	12	12	Adds 0.06x to Plinkies Mult
14	DICE TABLE	6·10¹¹	18	8, 61	+0.5% to Celebrity Chance
15	ACCOUNTANT	8·10⁴	27	10, 16, 19	/1.05 Particle Cost Reduction (Compounding) Adds 0.02x to Plinkies Mult
16	PENTHOUSE ROOMS	2·10⁷	18	11, 15 cruise lvl 7	+1 Rooms +1 Max Room Capacity Adds 0.02x to Group Mult
17	MORE ROOMS	2.5·10⁷	22	12, 18, 68	+2 Rooms
18	MORE BEDS IN ALL ROOMS	2.3·10¹¹	1	17	+8 Rooms
19	TRANSMISSION SPEED	32	80	15, 27	+0.12 Particle Output Per Sec (Isolated Additive) -0.3% Guest Arrival Time -0.3% Guest Checkout Time
20	MASTERY MILESTONE I mastery	0	1	28 1 maxed skills required	+3 to Maximum Guest Spending +35% Particle Output +7 Hours to Max Offline Time Cap
21	MASTERY MILESTONE II mastery	0	1	28 14 maxed skills required	Adds 0.33x to Plinkies Mult +42% Particle Output /1.5 to Particle Cost Reduction
22	HIRE ROOM SERVICE	100	5	17, 29	+1 Ticket Price +0.1 to Minimum Guest Spending, for each owned Room +0.4 to Maximum Guest Spending, for each owned Room
23	HYPER SPEED CHIP	10¹¹	3	31	-1% Guest Arrive Time -1% Guest Checkout Time
24	MINIGOLF	1.5·10⁸	1	33, 61	Better Reviews! +3 Max Room Capacity
25	TANNING DECK	8·10⁷	1	26, 33 cruise lvl 10	Adds 0.1x to Plinkies Mult per level in the Cruise Upgrade
26	KIDS EAT FOR FREE	6·10⁷	3	25, 34 cruise lvl 7	+1 Max Room Capacity
27	SOLAR PANELS	1	58	19, 35, 28	+3% Particle Output (Compounding)
28	ROOMS root	1	16	—	+1 Rooms
29	POOL AREA	3	48	28	+0.1 to Minimum Guest Spending +0.3 Maximum Guest Spending
30	BANNER ADS	6	14	29, 39	-0.7% Guest Arrival Time -0.5% Guest Checkout Time
31	EDUCATE SUN WORKERS	2·10¹¹	12	23, 40	+1 free level in Particle Life Time +1 free level in Particle Attraction +1 free level in Particle Sphere Size
32	TAKE ON SENIOR GROUPS	2.5·10¹¹	25	31 cruise lvl 7	Better Reviews! +5 Max Room Capacity
33	RESTAURANTS	10⁸	10	25, 24 cruise lvl 7	+1 Max Room Capacity +10% Particle Output +2 Rooms
34	DOUBLE BEDS	2·10⁷	5	26, 41 cruise lvl 7	+1 Max Room Capacity
35	WAREHOUSE WORKERS	1.24·10⁴	42	27, 41, 46	x1.03 Particle Output +0.2 Maximum Guest Spending +1 Free Level in Particle Spawn Rate
36	MASTERY MILESTONE III mastery	1	1	28 45 maxed skills required	Adds +2x to Plinkies Mult +100% Particle Output +5 Max Room Capacity
37	MASTERY MILESTONE IV mastery	1	1	28 60 maxed skills required	+200% Maximum Guest Spending +200% Minimum Guest Spending Adds +2x to Plinkies Mult
38	SUN BEDS	10	42	29, 42	+1 Ticket Price
39	TRANSFER	3.3·10⁵	12	30, 43, 40	-0.4% Guest Arrival Time -0.4% Guest Checkout Time
40	PAY WORKERS OVERTIME	10¹¹	1	31, 39	+2% Particle Output for every level in the Main Cruise Upgrade
41	SUN AURA	5·10⁴	1	34, 35, 45	+1% to Maximum Guest Spending for every level in Artificial Sun Spawn Rate
42	SPA AREA	2000	24	38, 67, 49	+0.8 to Minimum Guest Spending +2 Ticket Price
43	PLASMA DRIVETRAIN	10¹⁵	16	39 cruise lvl 7	-0.1% Guest Checkout Time +0.25% Celebrity Chance +2 Maximum Guest Spending
44	BUDGET CUTS	2·10⁹	44	45	Adds 0.04x to Plinkies Mult
45	CINEMA	2·10⁹	6	41	+3 Minimum Guest Spending Better Reviews! Adds 0.01x to Plinkies Mult
46	HIRE LAB MANAGER	1.2·10⁶	72	35, 47	x1.02 Particle Output (Compounding) /1.05 Particle Cost Reduction (Compounding) +50 Particle Output Per Sec (Isolated Additive)
47	ROLLERCOASTER	6·10⁷	28	46, 48	Adds 0.01x to Plinkies Mult +2 Maximum Guest Spending
48	CASINO	10⁷	52	67, 47	+3 Maximum Guest Spending x1.01 Maximum Guest Spending (Compounding)
49	TIME WARPER	2.5·10¹⁶	52	42	-0.1% Guest Arrival Time -0.15% Guest Checkout Time x1.01 Minimum Guest Spending (Compounding)
50	BOUNCER	5.2·10¹⁵	4	43	+1 Minimum Group Size -2% Guest Checkout Time -3% Guest Arrival Time
51	BLACK JACK TABLE	10¹⁷	100	57	Adds 0.01x to Celebrity Mult
52	SUN BATTERIES	10¹⁰	100	44	x1.02 Particle Output (Compounding)
53	TAKE NIGHT SHIFTS	6·10⁷	16	47	+1 Levels in Particle Attraction +1 Levels in Particle Sphere Size x1.08 Particle Output (Compounding)
54	LOUNGE	5·10⁸	1	47	Better Reviews! +25 Minimum Guest Spending
55	ENGINE CHIP	5·10¹⁶	25	49	-0.8% Guest Arrive Time -0.2% Guest Checkout Time Adds 0.01x to Plinkies Mult
56	BUBBLE BATH IN ROOMS	1.5·10¹⁷	30	55	+2 Minimum Guest Spending +1 Rooms
57	BOWLING	6.1·10¹⁶	3	50	+7 Minimum Guest Spending +10 Maximum Guest Spending
58	TAKE INVESTMENTS	1.5·10¹⁰	100	52	+1 Ticket Price +1 Minimum Guest Spending +1 Maximum Guest Spending
59	SLOT MACHINES	5·10⁸	3	54 cruise lvl 8	Adds 0.03x to Celebrity Mult +1% to Celebrity Chance
60	DISCO	2·10¹⁷	3	56	Better Reviews! +6 Maximum Guest Spending +15 levels to Particles Life Time
61	ENERGY CONVERTER	10⁹	2	14, 24	+10% Particle Output +100 Particle Output Per Sec (Isolated Additive)
62	RECEPTIONIST	4·10⁴	88	27	/1.03 Particle Cost Reduction (Compounding) +0.2 Minimum Guest Spending +0.2 Ticket Price
63	MASTERY UPGRADE I mastery	1000	200	27 1 maxed skills required	x1.036 Particle Output (Compounding, ^0.8 Diminishing Returns))
64	MASTERY UPGRADE II mastery	1500	200	38 1 maxed skills required	x1.04 Ticket Price (Compounding, ^0.8 Diminishing Returns)
65	MASTERY UPGRADE III mastery	1000	200	30 1 maxed skills required	-0.5% Arrival & Checkout Time (Asymptote Diminishing Returns)
66	MASTERY UPGRADE IV mastery	750	200	19 1 maxed skills required	+1 Particle Output (Isolated Additive, ^1.09)
67	FANCY TICKET BOOTHS	1.2·10⁴	34	48, 42 1 maxed skills required	+5 Ticket Price
68	ARTIFICIAL SUN ANALYSTS	2000	25	22, 17 1 maxed skills required	/1.05 Particle Cost Reduction
69	MASTERY UPGRADE V mastery	3000	200	22 1 maxed skills required	+1 Minimum Guest Spending (^0.8 Diminishing Returns) +1.1 Maximum Guest Spending (^0.8 Diminishing Returns)
70	GYM	140	11	29 1 maxed skills required	+0.5 Maximum Guest Spending
71	SUN AURA II	7·10⁷	1	15	+0.8% to Minimum Guest Spending for every level in Artificial Sun Spawn Rate
72	BETTER GROCERIES	10¹²	25	71	x1.06 Ticket Price (Compounding)
73	ARCADE MACHINES	2·10¹²	75	72, 74	x1.04 Minimum Guest Spending (Compounding) x1.04 Maximum Guest Spending (Compounding)
74	COUPLES MASSAGES	5·10¹²	43	74, 73, 72	+0.1x To Group Mult
75	GROUPS DISCOUNT	1.1·10¹³	12	73	x1.08 Minimum Room Capacity (Compounding) x1.08 Maximum Room Capacity (Compounding)
76	STAND UP SHOWS	1.5·10¹³	4	75	+0.2x To Group Multiplier
77	FAKE REVIEWS	2.5·10¹³	80	75, 76	+0.3x to Overall Star Rating Mult
78	GOLDEN TOILETPAPER	2.5·10¹⁰	21	59	+10% Celebrity Mult
79	VOID	5·10¹⁰	21	78	x1.02 Extra Prestige Mult (Compounding)
80	INCREASE PRICES	6·10¹⁰	13	78	1.02 Plinkies Mult (Compounding)
81	TAKE SCENIC ROUTE	7·10¹⁰	15	78	+3 to Celebrity Chance +4% Celebrity Mult
82	COMPRESSION MODULE	5·10¹⁷	60	78	/1.05 Prestige Fill Reduction
83	NO SINGLES!	10¹⁸	14	82	+2 Minimum Room Capacity
84	LAB MANAGERS	5·10¹⁸	10	83	/1.2 Particle Cost Reduction
85	GET AN ESCAPE ROOM	5·10¹⁸	9	84, 83	+0.3x To Group Mult
86	PREMIUM BEDS	10¹⁵	19	6, 1	x1.06 Ticket Price (Compounding)
87	CANDY STORE	2·10¹⁵	50	86	x1.01 Plinkies Mult (Compounding)
88	BUNK BEDS	5·10¹⁵	15	87, 89	x1.05 Max Room Capacity (Compounding) x1.05 Minimum Room Capacity (Compounding)
89	VENDING MACHINES	5·10¹⁵	11	88, 86	+25 Minimum Guest Spending +25 Maximum Guest Spending +5 Free Particle Spawn Rate Levels
90	SUN AURA III	5·10¹⁰	1	52	x1.006 particle output for every bought level in particle affixes, above 700
91	SUB MARINE TRIPS	10¹²	32	72	/1.04 Prestige Fill Reduction
92	CIRCUS	1.5·10¹⁰	25	31	/1.07 Prestige Fill Reduction (Compounding)
93	VISIT EXCITING PLACES	10¹⁰	15	24	Adds x0.2 to Plinkies Mult

How to read

BOUNCER (#50): 4 levels, base cost 5.2·10¹⁵ Plinkies, unlocked by skill 43. Each level grants +1 Minimum Group Size (additive), −2% Guest Checkout Time and −3% Guest Arrival Time (subtractPercentage).

Prestige — 9 upgrades (Circuits)

What Circuits buy across resets.

Upgrade	Effect	Base cost
PRESTIGE MULT	This upgrade adds a new Mult layer to the "Plinkie Guest Calculation" section of the Overview Page. (+1x per level) exponential +1/lvl · max 99	2 L≥0: ^1 +0.1
TICKET PRICE	This upgrade adds and increases a multiplier to Ticket Prices (x1.4 - Compounding). compounding +1.4/lvl · max 25	2 L≥0: ^1 +2 · L≥20: ^1 +20
MIN/MAX GUEST SPENDING	Increase your Minimum and Maximum Guest Spending evenly! (x1.35 - Compounding). compounding +1.35/lvl · max 25	2 L≥0: ^1 +2 · L≥20: ^1 +20
PARTICLE OUTPUT	Increase your particle output by x1.1 per level (Compounding) compounding +1.1/lvl · max 20	2 L≥0: ^1 +1
MAX OFFLINE TIME CAP	Increase your Max Offline Time Cap by 1 hour. additive +1/lvl · max 16	1 L≥0: ^1
BETTER REVIEWS	Higher chance for better review (More Stars). additive +1/lvl · max 10	3 L≥0: ^1
MORE SPACE	This upgrade adds +3 Rooms, +2 Max Room Cap and +1 Min Group Cap. (Min & Max Group Cap applies when lv. 7 is reached in the Cruise Upgrade. additive +0/lvl · max 10	15 L≥0: ^1 +3
ECHO TRIGGER COUNT	Trigger Echo on your Echo Mult +1 additional times. (Unlocks Echo Mult) additive +1/lvl · max 5	40 L≥0: ^1 +10
ECHO MULT	Adds 0.1x to your Echo Mult. additive +0.1/lvl · max 50	30 L≥0: ^1

Example

PRESTIGE MULT: +1× per level on the Plinkies multiplier (99 levels), base cost 2 Circuits, +0.1 cost per level. Circuits come from "fills": your cumulated Plinkies fill a gauge that converts when you prestige.

Cruise Ship — 50 levels

What each ship level improves. Exact costs computed in-game — validation pending.

Level	Improvement
1	Build Cruise Ship
2	Ticket Price
3	Checkout Time
4	Sun Output
5	Min Plinkies + Sun Cost
6	More Rooms
7	Larger Rooms
8	Arrival & Checkout Time
9	Overall Rating Mult
10	Ticket Price + cost redux
11	Sun Output
12	More Rooms
13	Group Mult
14	Ticket Price x2
15	Arrival & Checkout Time
16	Sun Output & Time
17	Plinkies Mult
18	More Rooms
19	Group Mult
20	Plinkies Mult + Ticket Price
21	Max Guest Spending
22	Rooms
23	Min Guest Spending
24	Extra Echo
25	Echo Mult (add)
26	Checkout Time + Particle Cost
27	Echo Mult (add)
28	Group Mult
29	Rooms + Min/Max Room Cap
30	Celebrity Chance Mult
31	Prestige Mult
32	Plinkies Mult
33	Ticket Price
34	Group Mult
35	Echo Mult
36	Room Capacity
37	Celebrity Chance
38	Rooms
39	Echo
40	Echo Mult (add)
41	Celebrity Mult
42	Prestige Mult
43	Plinkies Mult
44	Checkout Time + Particle Cost
45	Celebrity Chance Mult
46	Ticket Price
47	Min/Max Guest Spending
48	Rooms
49	Echo Mult
50	Final Reward

Example

Level 1 builds the Cruise Ship; level 14 doubles the Ticket Price; level 50 unlocks the final reward. Exact per-level costs are computed in-game and still pending validation — the "theme" column shows what each level improves.

Cost currency: proven for the Artificial Sun and prestige (serialized references); deduced for shop, skills and cruise (BigDouble costs, economy consistency) — in-game confirmation pending.