Monsters will be familiar to those of you who have tried your hand at Space Panic in the arcades.
The screen is divided into separate levels and you control a small figure who call move from level to level by climbing the ladders provided.
Throughout the game he is pursued by the monsters of the title - some of which look more like apples than anything else - and his only defence is his shovel, which he can use to dig holes in the floor.
In their haste to make a meal of you, the monsters fall into the holes, which you must then fill in so they can't clamber out.