Just an idea for a Waluigi’s gameboy game I had a while ago.
In this game you’d control Waluigi and he would be always carring a timing-out Bob-omb which you can throw (the count down is shown at the bottom of the screen), once it’s timed out, it explodes. So you’d have to time your attacks and always keep an eye on the exploding Bob-omb. You’d have 2 hit points. In the first hit (by enemy or timed out Bob-omb), you’d be dizzy for a short time (unable to attack / move), if you get hit again you’d lose a life and start the stage again. I think it would be a nice mechanic for a game.