Games like Solo Defending
Games like Solo Defending include Kingdom Rush - Tower Defense, Taur, DG2: Defense Grid 2, Plants vs. Zombies GOTY Edition, and Infested Planet. We matched them by the tags players give Solo Defending on Steam (Shoot 'Em Up, Tower Defense, Strategy, 2D, and Base Building): closest matches first, and among equally close ones the better-known games.

Kingdom Rush - Tower Defense
Shared: Tower Defense · Strategy · 2D

Taur
Shared: Tower Defense · Strategy · Base Building

DG2: Defense Grid 2
Shared: Tower Defense · Strategy · Sci-fi

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Strategy · 2D

Infested Planet
Shared: Tower Defense · Strategy · Action

Kingdom Rush Origins - Tower Defense
Shared: Tower Defense · Strategy · 2D

GemCraft - Chasing Shadows
Shared: Tower Defense · Strategy · Action

XCOM: Enemy Unknown
Shared: Strategy · Tactical · Sci-fi

Kingdom Rush 6: Genesis TD
Shared: Tower Defense · Strategy · 2D

Creeper World 3: Arc Eternal
Shared: Tower Defense · Strategy · Sci-fi

Mindustry
Shared: Tower Defense · Base Building · Strategy

Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer

RimWorld
Shared: Strategy · Base Building · Sci-fi

The Last Spell
Shared: Strategy · Tactical · 2D

Kingdom Rush 5: Alliance TD
Shared: Tower Defense · Strategy · 2D

Warhammer 40,000: Dawn of War III
Shared: Strategy · Sci-fi · Base Building

BattleTech
Shared: Strategy · Sci-fi · Tactical

Thronefall
Shared: Tower Defense · Strategy · Base Building

Sanctum 2
Shared: Tower Defense · Strategy · Sci-fi

Dome Keeper
Shared: Tower Defense · Sci-fi · Action

Forts
Shared: Strategy · Base Building · 2D

Warhammer 40,000: Dawn of War - Anniversary Edition (Classic)
Shared: Strategy · Base Building · Sci-fi

Kingdom Rush Frontiers - Tower Defense
Shared: Tower Defense · Strategy · 2D

Rock 'N' Roll Defense
Shared: Tower Defense · Strategy · Action

