Free games like Duke of Defense
Below are 8 free-to-play Steam games similar to Duke of Defense, 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 Duke of Defense page.
Ranked picks
- 1
Kingdom: Classic
Free-to-play alternative to Duke of Defense — no purchase or trial window. Shares Strategy with Duke of Defense.
Kingdom is a 2D sidescrolling strategy/resource management hybrid with a minimalist feel wrapped in a beautiful, modern pixel art aesthetic.
- 2
Ninja Kiwi Archive
Free-to-play alternative to Duke of Defense — no purchase or trial window. Shares Strategy and Casual with Duke of Defense.
Enjoy some of the best loved Flash games of the past in this awesome time capsule of over 60 Ninja Kiwi classics. Experience a piece of history and play the original Flash games that spawned the worldwide phenomenon of Bloons TD.
- 3
HF: Probation
Free-to-play alternative to Duke of Defense — no purchase or trial window. Shares Strategy and Casual with Duke of Defense.
Dear candidate, start your free probation period as manager of Hell! Punish sinners by using our deck-building system, constructing fiendish towers to manage underworld hordes. Good luck!
- 4
Firework War
Free-to-play alternative to Duke of Defense — no purchase or trial window. Shares Strategy and Casual with Duke of Defense.
Use a variety of fireworks to fend off misfortune and protect your family!
- 5
Grow Defense
Free-to-play alternative to Duke of Defense — no purchase or trial window. Shares Strategy and Casual with Duke of Defense.
Upgrade your Castle and Unlock new tiers of Skills and Weapons to Defend vs Monsters and Bosses across VARIOUS ZONES! Find Rare ITEMS dropped from monsters and bosses and upgrade them to their full potential! Defeat RAID Mega-Bosses to find LEGENDARY items!
- 6
Idle TD: Heroes vs Zombies
Free-to-play alternative to Duke of Defense — no purchase or trial window. Shares Strategy and Casual with Duke of Defense.
An endless Tower Defense game of epic heroes vs evil zombies. Unlock and upgrade countless Heroes, artifacts, and technologies to defend against the infinite zombie swarms. Strategize the most effective placement of Heroes to synergize their skills and abilities.
- 7
METAL SLUG DEFENSE
Free-to-play alternative to Duke of Defense — no purchase or trial window.
“METAL SLUG”, the pinnacle of 2D action-shooting on NEOGEO returns in a brand new strategy game on Steam!
- 8
Idle Monster TD
Free-to-play alternative to Duke of Defense — no purchase or trial window. Shares Strategy and Casual with Duke of Defense.
An endless Tower Defense game of epic Monsters vs evil War Machines. Unlock and upgrade tons of unique elemental Monsters (Water, Air, Earth, and Fire) to defend your home from an infinite swarm of robots. Strategize the most effective placement of Monsters to synergize their elemental abilities.