Unlimited health.
Greenie 2 is a big fat liar. It claims to be "a sequel to a mediocre game, but with more levels..." which is a dirty lie. Greenie 2 shouldn't be anywhere near the word "mediocre", and Letmethink should be ashamed for making a platform game with such false conceptions of modesty. Much like its titular hero, Greenie 2 is a tight little bundle of fun and efficiency, a no-frills jumping game with a little puzzle sprinkled on top.
Move with the [arrows] or [WASD] keys and press the [spacebar] or [Z] to shift those translucent blue blocks from solid to non-solid and back again. There's the odd spike patch, or button pushing puzzle, and occasionally there are short little color-coded enemies that can be manipulated into pushing switches for you. Call it spare, call it retro, call it more fun than a basket of kittens, but "mediocre" is one thing this series is not.