Single-player games like Summer Islands
Below are 15 single-player Steam games similar to Summer Islands, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Summer Islands page.
Ranked picks
- 1
Archipeo
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Simulation with Summer Islands.
Archipeo, a retro-inspired multiplayer city builder. Grow a single island into a sprawling empire. Optimize production chains, explore a procedurally generated ocean world, and command fleets across a living archipelago. Alone, cooperatively, or in rivalry with friends.
- 2
Software Inc.
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Indie with Summer Islands.
Construct and design buildings for optimal working conditions. Hire people to design and release software, so you can defeat the simulated competition and take over their businesses. Manage and educate your employees to make sure they are skilled and satisfied with their job.
- 3
Ascendant Realms
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Indie with Summer Islands.
In Ascendant Realms you lead a nation in a struggle for glory. Cozy setting meets tactical thinking from classic turn based strategies, but twists it with compact gameplay. Develop your city, research new technologies, fight other leaders - or just create your own story in the sandbox.
- 4
Parkitect
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Indie with Summer Islands.
Parkitect is a business simulation game that charges you with the construction and management of theme parks! Bringing back the best of classic theme park games with many new features and content on top. Now supports online co-op with up to 8 players!
- 5
Dune: Spice Wars
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy with Summer Islands.
A 4X real-time strategy game from the developers of the critically acclaimed Northgard. Set in Frank Herbert’s groundbreaking Dune universe, you must lead your faction and battle for control and dominance over the harsh desert planet of Arrakis.
- 6
Rail Route
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Indie with Summer Islands.
In Rail Route, you will design, construct, upgrade, and automate your railway network in one of the many maps based on real-life cities worldwide. Dispatch the trains to make the traffic flow and the network grow!
- 7
Pioneers of Pagonia
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Simulation with Summer Islands.
Rebuild hope in a world that was lost in the fog. Lead your Pioneers across the isles of Pagonia, unite scattered tribes, raise thriving communities and discover the history of your people as you reclaim your world in the new story campaign.
- 8
Worldwide Rush
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Indie with Summer Islands.
Worldwide Rush lets you experience passenger transportation and management on a global scale. Expand your company, meet the growing travel demand, compete against other companies, and discover new continents with its unique vehicles. The entire world is yours to control.
- 9
RollerCoaster Tycoon World™
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Simulation with Summer Islands.
RollerCoaster Tycoon World™ is the newest installment in the legendary RCT franchise. This next-generation theme park simulation and building game includes fan-favorite features along with incredible new advancements!
- 10
The Park®
Single-player alternative to Summer Islands — playable solo, no multiplayer required.
Set in a creepy amusement park hiding a dark and sinister secret, The Park is a first-person psychological horror experience focused on exploration and storytelling.
- 11
Theme Park Simulator: Rollercoaster Paradise
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Indie and Simulation with Summer Islands.
Theme Park Simulator is a physics simulation game in which you experience a wide array of different attractions. Ranging from rollercoasters to bumper cars, there’s a ride for everyone in Theme Park Simulator!
- 12
Мухосранск | Russian City Sim
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Indie and Simulation with Summer Islands.
The atmosphere of the nuclear wasteland.
- 13
Idle Transport Tycoon
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Indie and Simulation with Summer Islands.
Enjoy fast, stress-free management! Build your service network, merge houses, and transport guests via train & ropeway. Upgrade facilities, hire staff, and climb the leaderboards in this bite-sized tycoon experience designed to be finished in one sitting; but still runs well in background.
- 14
Holiday Island
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Indie and Simulation with Summer Islands.
There will be sand. There will be girls. There will be sun. And yes, there will be nudity.
- 15
Transport Tycoon Deluxe
Single-player alternative to Summer Islands — playable solo, no multiplayer required. Shares Strategy and Simulation with Summer Islands.
Transport Tycoon Deluxe challenges you to become the ultimate Transport Tycoon by creating a transit empire. Build a network of trains, trucks, ships, planes, and more to grow your business, make money, and fend off rivals in this 1995 building sim from Chris Sawyer.