Default Controls
← → ↑ ↓ = Directions
A = Z
B = X
Mode = Right Shift
Start = Enter
About the Global Defense (USA, Europe) SEGA Master System (PSX) Online Game
Hey, want to play Global Defense for SEGA Master System? You can now play this classic game online for free in your browser! Defend the Earth from alien invaders by strategically placing missile launchers to shoot down enemy spacecraft. Test your reflexes and decision-making skills in this fast-paced arcade game. No need to download anything, just start playing and have fun!