| Game Manual: | N/A | | Game Music: | N/A |
| In Oisac you control a crosshair across the screen and must shoot down the soldiers of the Oisac empire. Enemies appear in the center and move toward the edges – if they escape, part of your shield is depleted. Once the shield is gone, the game ends. To complete a level, you need to destroy twenty enemies. Ghost ships are especially dangerous: if they manage to escape, they instantly wipe out your entire shield. |
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