Able to zap into, and out of Electrical appliances, circuits, whatever have you. And travel with in them. Could be used for puzzles or assassination.

Ex. Puzzle:
In order to get into the next room, the player needs to travel along circuits in the walls. However within the circuits, is various instances of corrupted data which you must avoid at all costs, lest you die.

Sounds Cool Weasal, Anyone else got any ideas

A game you need to eat or else you shrink and if you eat you get bigger

I am making an adventure game with game maker. I need to think of a special ability the charactor could have

Adventure. Game Maker

What genre? What engine?

In Minecraft or somewhere else? Either way a videogame is not complete without a good story behind it! It's a lot like writing a book... only the players are the characters in the story. But enough of that, ever heard of a game called doors? It's where you pick a door and the entire story depends on which doors you pick, and it can be as long or short as you like! It's really fun once you learn how to play it properly!