Free games like Sentinels
Below are 9 free-to-play Steam games similar to Sentinels, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Sentinels page.
Ranked picks
- 1
The Riftbreaker: Prologue
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Strategy with Sentinels.
The Riftbreaker: Prologue allows you to experience the events taking place before the story campaign of the main game. Explore an entirely new world. Gather resources. Build up a base. Defend yourself from thousands of alien creatures.
- 2
Nazi Zombies
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Indie with Sentinels.
Nazi Zombies is a cooperative survival game where players fend off escalating waves of Nazi zombies, earning points by killing zombies and repairing barriers to buy weapons, upgrades, perks, and unlock new map areas to maximize their survival.
- 3
Bloons TD Battles 2
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Strategy with Sentinels.
From the creators of Bloons TD6... Bloons TD Battles 2 is a brand new installment of the top-rated head-to-head tower defense game. Gather your Hero, choose your team of powerful Monkey Towers, and prepare to battle one on one against other players and relentless waves of Bloons!
- 4
Bloons TD Battles
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Strategy with Sentinels.
Go head to head with other players in a Bloon-popping battle for victory. From the creators of best-selling Bloons TD 5, this all new Battles game is specially designed for multiplayer combat, featuring the ability to control bloons directly and send them charging past your opponent's defenses.
- 5
Blackwake
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Strategy with Sentinels.
Blackwake is a multiplayer naval FPS focused on teamwork and cooperation. Fire the cannons, sink enemy ships or board them with firearms and steel.
- 6
Darwin Project
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Indie with Sentinels.
In Darwin Project, ten inmates must survive the elements, track each other, fight, craft tools, and use their social skills to be the last one standing. It's a unique take on battle royale with a Show Director to influence the match and Spectator Interactions to create a one-of-a-kind game show.
- 7
Yet Another Zombie Defense
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Strategy with Sentinels.
Darkness is coming. How long can YOU survive? Build your base by day, defend it by night. Play in online or local co-op. Stay alive as long as you can.
- 8
AirMech
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Strategy with Sentinels.
AirMech® Strike is a fast paced Action-RTS game that can be played solo, coop, or competitively online. Earn Kudos and Experience in battle and unlock a wide collection of AirMechs and Units while you practice the perfect strategy to emerge victorious!
- 9
Eden Rising
Free-to-play alternative to Sentinels — no purchase or trial window. Shares Action and Strategy with Sentinels.
Brace yourself for a brand new action-packed Open World. Explore a huge world to gather materials for gear and defenses. Use everything at your disposal to defend your bases and defeat hordes of hostile monsters. Play solo or up to 8-player online!