Using either a joystick or the keyboard, you control the up and down movement of Shadowfax - a galloping white horse situated on the left of the screen.
Hordes of black horses gallop towards you, which you must either dodge or shoot. To do the latter, you launch a thunderbolt and by releasing the fire button at the crucial time, it will hopefully explode at one of the approaching mounts. As the game progresses it gets faster and faster, until inevitably you fail to dodge one of the black stallions - or the RSPCA catch up with you.
On the credit side, the animation of the galloping horse and the sound effects are very good - even on the Vic version. But the game is very unimaginative and has little to hold interest for long. The cassette has a C64 version on one side and a version for the unexpanded Vic on the other.