Orc Invasion is a tactical strategy game where players defend a medieval village from waves of invading orcs. The game takes place on a grid-based map, with the player's defenses positioned at the top and the orc horde advancing from the bottom.
To play, the player must position units, such as swordsmen and archers, strategically to take out waves of orcs while minimizing casualties. The core mechanic involves clicking and dragging to select and move units, as well as using context menus to access special abilities and attributes. The objective is to survive for as long as possible as the orc horde grows in size and ferocity.
Players can employ various tactics to succeed, from holding off on producing new units until the orcs reach the village, to spreading defenders out across the map to relentlessly pick off stray orcs. The game is optimized to run in the browser without the need for download or registration, allowing players to jump in and start deploying their defenses right away.