Sega Master System / Mark III / Game Gear
Sega's enormous coin-op has had it's fluid drained and has been squeezed down to fit inside a Master System box. Yes, impossible though it may seem, Galaxy Force has been converted to the Sega, and it's brilliant.
Four levels of 3D shooting action await the player, each scene including a plenty run and then a trip down a hazard-packed tunnel to destroy the target at the end.
The graphics are truly marvellous, and the gameplay is challenging enough to keep you occupied for weeks. If you're after the best 3D game on the Sega, look no further than this.