The rover is a monster introduced in Chip's Challenge 2. It can travel over dirt, gravel, and other similar tiles which normally block monsters. Like ghosts, rovers have the ability to pick up and use keys and boots. Its movement mimics that of other monsters and changes periodically from one type of movement to another.
Each behavior lasts for 32 attempted moves. A cycle can be shortened if the rover gets stuck/runs into a wall, and can be lengthened by delaying voluntary movement, e.g. with slides, being trapped, or being on a clone machine (in which cases it will not update for the duration it cannot voluntarily move). However, each movement tick a rover attempts to move but can’t counts as 2 attempted moves instead of 1, so e.g. for a rover surrounded by walls, each non-teeth cycle lasts 0.8 seconds rather than 32 movement ticks / (20 movement ticks / second) = 1.6 seconds (teeth cycles last twice as long as non-teeth cycles).