Single-player games like STEM Defense
Below are 8 single-player Steam games similar to STEM Defense, 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 STEM Defense page.
Ranked picks
- 1
Terrorformer TD
Single-player alternative to STEM Defense — playable solo, no multiplayer required. Shares Strategy with STEM Defense.
Terrorformer TD is a tower defense roguelite with a procedurally generated map that YOU shape! Raise or lower tiles, divert enemy paths and funnel monsters into perfectly designed killzones. Randomly drawn cards result in plenty of run variety, as you seek to survive endless waves of enemies.
- 2
Deep Among the Swarm
Single-player alternative to STEM Defense — playable solo, no multiplayer required. Shares Strategy with STEM Defense.
Deep Among the Swarm is a challenging survival RTS roguelite about surviving against thousands of enemies. Drill ever deeper underground while fighting the endless onslaught of the Swarm. Can you save humanity?
- 3
Landnama
Single-player alternative to STEM Defense — playable solo, no multiplayer required. Shares Strategy with STEM Defense.
Face the judgment of winter’s deadly toll as you lead the first Viking clans to settle Iceland in this non-violent, rogue-lite survival base builder.
- 4
Tower Dominion
Single-player alternative to STEM Defense — playable solo, no multiplayer required. Shares Strategy with STEM Defense.
Build and design the terrain while defending your stronghold against alien invasion in this unique Roguelike tower defense. Choose from 30 heroes, survive enemy waves, and upgrade a variety of destructive towers to hold the line!
- 5
Rogue Tower
Single-player alternative to STEM Defense — playable solo, no multiplayer required. Shares Strategy with STEM Defense.
Rogue Tower is a tower defense game with roguelike elements and a continuously expanding path which you can influence. Unlock, build, upgrade, expand, defend.
- 6
Kingdom: New Lands
Single-player alternative to STEM Defense — playable solo, no multiplayer required. Shares Strategy and Indie with STEM Defense.
Kingdom: New Lands builds upon the award-winning gameplay and mystery of Kingdom by introducing an abundance of new content to the IGF-nominated title while maintaining the simplicity and depth that legions of monarchs have come to experience and enjoy.
- 7
EcoGnomix
Single-player alternative to STEM Defense — playable solo, no multiplayer required. Shares Strategy and Indie with STEM Defense.
A quirky mix of roguelite and city builder. Build a lively little city above, by looting mystical caves with a team of gnomes below! Use multiple runs to unlock upgrades and abilities to help your gnomes venture deeper into the dangerous underground.
- 8
Hexguardian
Single-player alternative to STEM Defense — playable solo, no multiplayer required. Shares Strategy with STEM Defense.
Hexguardian is a roguelite, tower defense game where you build your own maps with hexagonal tiles! Build and upgrade towers, recruit armies, learn spells, construct wonders and place hexagonal tiles to create a path to enhance your defenses. With plenty of game modes and talents to unlock!