Riftle.

Type any five letters and press enter. A green tile is the right letter in the right place, a gold one is the right letter somewhere else, and a grey one is not in the word at all.

Guesses aren't checked against a dictionary, so you can open with whatever probes the alphabet best. Only the answers come from League — every one of them is a champion, an item, a monster, a place, a rune, or a piece of the vocabulary. Today's word is the same for everyone; endless gives you a new one whenever you want.

Everything lives in this browser and nowhere else. Save a copy from the bottom of the page if you'd like to keep it.