100th is a short but deep puzzle platformer with a fairly simple difficulty curve, plus optional and difficult challenge branches (for those who feel so inclined). It is not extremely difficult to complete, but there are a lot of secrets for those hardcore completionists out there.
In 100th, you play a small character with a balloon companion. There are no enemies, only environmental hazards; your fickle friend, however, makes for a uniquely challenging experience to the end.
Controls Use the arrows to move and jump.
Hold Z to hold balloon.
CTRL, SHIFT, X, and V all also work (necessary for some keyboards).
Press M to silence music, you heartless robot you.
Points: Earn extra bonus points if you make it to the end with the original RED balloon. If you lose the balloon, you can always get a blue one, but this will result in fewer points.