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Summer Islands

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App ID 731650
App Type Game
Developer
Publisher Marttalin Games
Franchise Marttalin Games
Supported Systems Windows Linux
Last Changenumber 37655490
Last Record Update 30 July 2026 – 20:13:33 UTC ()
Release Date 25 January 2025 – 13:42:28 UTC ()
❓ 74.86%
197 reviews
0
In-Game
+21
🏗️ Building 🏦 Economy 💡 Strategy 🔀 Procedural Generation 🤑 Capitalism

Summer Islands is a holiday real-time strategy business simulator. Be the right businessman, build your holiday paradise and grab the money from your tourists. Play alone, with your friends and with computer enemies and survive natural disasters without going insolvent.

Additional Information

Developer Marttalin Games
controller_support full
community_visible_stats Yes
workshop_visible Yes
ReleaseState released
Publisher Marttalin Games
Store Release Date 25 January 2025 – 13:42:35 UTC ()
osarch 64
community_hub_visible Yes
Social Media https://www.instagram.com/marttalingames/
https://mastodon.social/@Marttalin
https://www.youtube.com/@Marttalin
Primary Genre Simulation (28)
Store Genres Casual (4), Indie (23), Simulation (28), Strategy (2)
Steam Release Date 25 January 2025 – 13:42:28 UTC ()
Store Asset Modification Time 19 November 2025 – 14:15:02 UTC () (1763561702)
library_assets
library_capsuleen
library_heroen
library_hero_bluren
library_logoen
library_headeren
logo_position ↴
pinned_positionCenterCenter
width_pct100
height_pct100
osextended empty string
review_score 8
review_percentage 81
Detected Technologies NWJS SDK, NodeJS SDK
Steam Deck Compatibility
  • Steam Deck:
  • All functionality is accessible when using the default controller configuration
  • This game shows Steam Deck controller icons
  • In-game interface text is legible on Steam Deck
  • This game's default graphics configuration performs well on Steam Deck
  •  
  • SteamOS:
  • This game runs successfully on SteamOS
  •  
  • category: Verified
  • steamos_compatibility: Compatible
  • steam_machine_compatibility: 3
  • test_timestamp: 11 June 2024 – 00:00:00 UTC
  • tested_build_id: 14657156
  • steam_machine_tests:
    0 ↴
    display4
    token#SteamMachine_TestResult_DefaultControllerConfigFullyFunctional
    1 ↴
    display4
    token#SteamMachine_TestResult_ControllerGlyphsMatchDevice
    2 ↴
    display4
    token#SteamMachine_TestResult_DefaultConfigurationIsPerformant
  • configuration:
    supported_inputgamepad
    requires_manual_keyboard_invoke0
    requires_non_controller_launcher_nav0
    primary_player_is_controller_slot_00
    non_deck_display_glyphs0
    small_text0
    requires_internet_for_setup0
    requires_internet_for_singleplayer0
    recommended_runtimenative
    requires_h2640
    requires_voice_files0
    gamescope_frame_limiter_not_supported0
    hdr_support0
    requires_proton_soundfonts0
controllertagwizard Yes
Early Access Release Date 21 June 2019 – 00:00:00 UTC ()
First seen on SteamDB 7 October 2017 – 08:39:00 UTC (), in changelist #3507171

Supported Languages

16 Languages Interface Full Audio Subtitles
German Yes Yes
English Yes Yes
Spanish - Spain Yes Yes
French Yes
Italian Yes
Arabic Yes
Portuguese - Brazil Yes
Traditional Chinese Yes
Simplified Chinese Yes
Japanese Yes
Korean Yes
Polish Yes
Russian Yes
Turkish Yes
Ukrainian Yes
Swedish Yes

Tags

🏗️ Building 🏦 Economy 💡 Strategy 🔀 Procedural Generation 🤑 Capitalism 😌 Casual 💼 Management 👾 Pixel Graphics 👾 Retro 🖥️ Simulation 🕹️ Multiplayer ▶️ Real Time Tactics 🧱 Sandbox 👤 Singleplayer 📖 Level Editor 🤝 Co-op 🎮 Controller 🥊 PvP 👥 Online Co-Op 👥 Local Co-Op

Categories

Single-player Online PvP LAN PvP Online Co-op LAN Co-op Steam Achievements Steam Trading Cards Steam Workshop Steam Cloud Stats Includes level editor Family Sharing Multi-player PvP Co-op Cloud Gaming Cloud Gaming (NVIDIA)

Hardware Categories

Full Controller Support DualShock Controllers (USB Only) DualShock Controllers DualSense Controllers (USB Only) DualSense Controllers

Accessibility Categories

Color Alternatives Camera Comfort Custom Volume Controls Playable without Timed Input Mouse Only Option Adjustable Difficulty Save Anytime Playable At Your Own Pace Contrast Controls

Assets

Load all asset images
clienticon 21e2a0f67b47a6498ee1e9be5628f8832d7324ef
clienttga 41d5592b645e423108ead9b286672fdd51405e16
icon 0dab054949858255a7a8961b5be9b47dba755874
logo ae6ad4bf07966ec1c81f3ee738b0601e9f58a5ed
logo_small ae6ad4bf07966ec1c81f3ee738b0601e9f58a5ed_thumb
small_capsule
english234a27ef766895b6224f6ca0da37fbb6f87e5a85/capsule_231x87.jpg
header_image
englishheader.jpg
library_assets_full
library_capsule ↴
image/english1cd90dc8508aa24c33b9c45551832c7540d3dba0/library_600x900.jpg
image2x/english1cd90dc8508aa24c33b9c45551832c7540d3dba0/library_600x900_2x.jpg
library_hero ↴
image/english4a7c677e288b6c768a0ab0e3c303a83c03616264/library_hero.jpg
image2x/english4a7c677e288b6c768a0ab0e3c303a83c03616264/library_hero_2x.jpg
library_hero_blur ↴
image/english4a7c677e288b6c768a0ab0e3c303a83c03616264/library_hero_blur.jpg
library_logo ↴
image/english34df6541436fd291e12bde4d8568907a49809140/logo.png
logo_position/pinned_positionCenterCenter
logo_position/width_pct100
logo_position/height_pct100
image2x/english34df6541436fd291e12bde4d8568907a49809140/logo_2x.png
library_header ↴
image/englishf302882a34d1f3a727018522c80ef1590e31ec9c/library_header.jpg
image2x/englishf302882a34d1f3a727018522c80ef1590e31ec9c/library_header_2x.jpg
Assets
main_capsule040df0112a3b72219846dfdda745b30899170ed5/capsule_616x353.jpg
main_capsule_2x040df0112a3b72219846dfdda745b30899170ed5/capsule_616x353_2x.jpg
small_capsule234a27ef766895b6224f6ca0da37fbb6f87e5a85/capsule_231x87.jpg
small_capsule_2x234a27ef766895b6224f6ca0da37fbb6f87e5a85/capsule_231x87_2x.jpg
headerheader.jpg
header_2xheader_2x.jpg
page_background680e0e1bb8efde400df127af5816fe2be89b5ebd/page_bg_v6.jpg
hero_capsulebe9d2769771aaf2c0f1a088c8635ca78ebb90b12/hero_capsule.jpg
hero_capsule_2xbe9d2769771aaf2c0f1a088c8635ca78ebb90b12/hero_capsule_2x.jpg
library_capsule1cd90dc8508aa24c33b9c45551832c7540d3dba0/library_600x900.jpg
library_capsule_2x1cd90dc8508aa24c33b9c45551832c7540d3dba0/library_600x900_2x.jpg
library_hero4a7c677e288b6c768a0ab0e3c303a83c03616264/library_hero.jpg
library_hero_2x4a7c677e288b6c768a0ab0e3c303a83c03616264/library_hero_2x.jpg
community_icon0dab054949858255a7a8961b5be9b47dba755874.jpg
page_background_pathapp/731650
raw_page_background680e0e1bb8efde400df127af5816fe2be89b5ebd/page_bg_raw.jpg
last_modified1 June 2026 – 19:54:09 UTC
timestamp1 June 2026 – 19:54:09 UTC

Trailer 739996 ↴

trailer_name Summer Islands Quick Tutorial EN
trailer_category 1
microtrailer ↴
video/webm 731650/739996/2f56b4ee2c67f9ea54065e54b067371abcd52066/1751137394/microtrailer.webm
video/mp4 731650/739996/2f56b4ee2c67f9ea54065e54b067371abcd52066/1751137394/microtrailer.mp4
adaptive_trailers ↴
dash_av1 731650/739996/2f56b4ee2c67f9ea54065e54b067371abcd52066/1751137394/dash_av1.mpd
dash_h264 731650/739996/2f56b4ee2c67f9ea54065e54b067371abcd52066/1751137394/dash_h264.mpd
hls_h264 731650/739996/2f56b4ee2c67f9ea54065e54b067371abcd52066/1751137394/hls_264_master.m3u8
screenshot_medium 257045980/movie.293x165.jpg
screenshot_full 257045980/movie_full.jpg
all_ages true
is_highlight true
timestamp 16 October 2024 – 10:00:25 UTC

Trailer 308855 ↴

trailer_name The Story in Summer Islands
trailer_category 3
microtrailer ↴
video/webm 731650/308855/043a2e6dbed12b98cb5f7ce5eb572915e2121b37/1751137393/microtrailer.webm
video/mp4 731650/308855/043a2e6dbed12b98cb5f7ce5eb572915e2121b37/1751137393/microtrailer.mp4
adaptive_trailers ↴
dash_av1 731650/308855/043a2e6dbed12b98cb5f7ce5eb572915e2121b37/1751137393/dash_av1.mpd
dash_h264 731650/308855/043a2e6dbed12b98cb5f7ce5eb572915e2121b37/1751137393/dash_h264.mpd
hls_h264 731650/308855/043a2e6dbed12b98cb5f7ce5eb572915e2121b37/1751137393/hls_264_master.m3u8
screenshot_medium 256799071/movie.293x165.jpg
screenshot_full 256799071/movie_full.jpg
all_ages true
timestamp 16 October 2024 – 10:00:30 UTC

User File System

Key Value
quota 93.13 GiB (100000000000)
maxnumfiles 10000
savefiles
0 ↴
rootgameinstall
pathsavegames
pattern*.data
1 ↴
rootgameinstall
pathsavegames
pattern*.info

Save File Locations

Based on the configuration above, this is where we think the save files are located.

Read more about cloud saves in Steamworks documentation.

Platform Path Pattern
[All OSes] [Steam Library]/steamapps/common/Summer Islands/savegames *.data
[All OSes] [Steam Library]/steamapps/common/Summer Islands/savegames *.info
Open link