Sanctum 2

Blend tower‑defense strategy with first‑person shooting in a sci‑fi co‑op adventure.

gameFirst-Person Shootersshooterreal time strategyindie

Alternatives

Orcs Must Die! 2

Orcs Must Die! 2 thrusts players and their friends back into battle against a terrifying mob of orcs and other monsters.

✦ Best for co‑op fans who love trap‑heavy action strategy on pc

Paid (One-time)ProprietaryPCSpellbook-UpgradeCo-op-CombatTower-Defense

“Combines tower‑defense strategy with first‑person shooting, a close genre hybrid to OMD2.”

Sanctum

AI-suggested

Sanctum puts you in the boots of elite soldier Skye, defending against alien hordes on a handful of uniquely designed maps. Build and upgrade turrets, then jump into the fray yourself to support your defenses and crush the invaders.

✦ Best for players who love fps‑tower‑defense hybrids and co‑op play

Paid (One-time)ProprietaryPCMacHybrid GameplayCo‑op ModeMap Variety

“Direct sequel that keeps the FPS‑tower‑defense hybrid gameplay in a sci‑fi setting.”

Natural Selection 2

AI-suggested

Natural Selection 2 blends first‑person shooter action with real‑time strategy, letting players command either the technologically advanced Marines or the adaptable Alien hive.

✦ Best for competitive fps/rts fans

Paid (One-time)ProprietaryPCHybrid FPS/RTSEvolutionary GameplayTeam‑Based Combat

Anomaly Defenders

AI-suggested

Anomaly Defenders flips the classic Tower Offense formula, putting you in charge of alien defenses as humans launch a massive counter‑attack. Build, upgrade, and sacrifice towers while reacting to enemy fire in real‑time battles across a sci‑fi battlefield.

✦ Best for players who love deep tower tech trees and fast real‑time strategy

Paid (One-time)ProprietaryLinuxAndroidPCReal-Time CombatUpgradeable TowersTech‑Tree Customization

“Hybrid shooter‑tower‑defense with sci‑fi setting; players build/upgrade towers while fighting, a close gameplay hybrid.”

Iron Grip: Warlord

AI-suggested

Iron Grip: Warlord reinvents tower defense by putting you directly in the fight. As a first‑person shooter you defend Atelia against relentless AI hordes, building and upgrading towers while blasting enemies yourself.

✦ Best for fps‑tower‑defense fans craving co‑op multiplayer

Paid (One-time)ProprietaryPCFirst-Person CombatTower BuildingCo‑op Multiplayer

“Sanctum 2 continues the FPS‑tower‑defense formula with co‑op, matching the target’s core gameplay.”

Anomaly 2

AI-suggested

Anomaly 2 expands the tower‑offense formula of its predecessor with a richer single‑player campaign and a groundbreaking multiplayer mode that pits tower‑defense against tower‑offense.

✦ Best for tactical strategy fans craving sci‑fi narrative and multiplayer depth

Paid (One-time)ProprietaryPlayStation 4LinuxAndroidDynamic-MultiplayerTactical-PlanningCommander-Control