Worm2000 - description from Softdepia.com:
Worm 2000 is a remake of the classic arcade python-style game. Drive a worm through a maze, on the way eating as many bright-colored apples as you can. After eating each apple the worm grows a bit longer and therefore is more tricky to operate. Lead your worm from the easy beginners levels to the most challenging final level through many rooms, corridors and tunnels of the game world. Don't forget that collisions with walls, dangerous "bombs" scattered around may be fatal! Customize your worm! Options let you control the game speed and the worm's appearance. Select any of 14 game skins or design a new one. There are 10 basic game levels and 50 additional levels available for registered users. A small registration fee of just $10 will give you another 50 levels and that's a lot of fun!
Worm2000 is a "Free to try" program. You can download and try it for an evaluation period.