Monty's a fairly ordinary guy, who wants to be rich and famous just like anybody else. The fame aim can be achieved by rescuing yet another damsel in distress, riches arriving in the form of gold scattered about the various screens he had to get through to reach her.
Each screen has a number of gold blocks, and only when Monty has picked up all these by passing through them does the doorway to the next screen open. Naturally there are obstacles, these being the usual variety of beasties that patrol up and down, left and right in set patterns. Monty nips in and out, hiding in little niches, or following the patrolling meanies and having to skip out of the way at the very last second into a hidey-hole.
The manoeuvring is tricky enough, made worse by Monty's keenness to get in the direction he's going - in other words he won't stand still, and just keeps travelling till you change his direction by keyboard or joystick. For that reason I didn't find it the easiest of games to play, but three cheers for the keyboard layout of Q/A/O/P for Up/Down/Left/Right.
Graphics and sound are good, and Mutant Monty holds its own with most of the Amstrad software that's around.