Break into the Ghost Quarantine to rescue a Ghost held captive. Battle your way through 35 new levels in another epic campaign. Collect Data Cores and permanently upgrade your programs.
-Build towers to defend your Data Cores against hostile enemies.
-Earn memory by defeating enemies to build more towers.
-Place upgrade programs into your towers to customize them.
A – 3x Speed
S – Hold down for 10x speed
D – Send next wave
Space – Pause the game