🎮 Play Alpha Mission Ii Aso Ii Last Guardian Prototype Prototype Online (Arcade)

This is a rare prototype build of Alpha Mission II (also known as ASO II: Last Guardian), a vertical scrolling shoot ’em up developed by SNK for the Neo Geo arcade hardware in 1991. Unlike the final commercial release, this early work-in-progress version is shorter—ending after the first three stages—and features minor differences in art direction, alongside a unique musical track that was removed before the game was finished.

How to Play

Your objective is to pilot your spacecraft through enemy territory, dodging fire and destroying targets. The prototype uses standard arcade controls: use the joystick (mapped to the arrow keys) to move your ship. Press the primary fire button (Z or X) to shoot enemies, and use your secondary button to deploy your modular armor once you have collected enough pieces.

Tips

• Because this is an unfinished prototype, some features may behave unpredictably compared to the final 1991 release.
• Conserve your armor energy for difficult sections or boss encounters, as deploying your armor drains your reserves.