If you’re a mobile gamer, there’s a good chance that Threes! and Monument Valley were on the top of your Best of 2014 lists a few months back. And while you wouldn’t be wrong to choose either of those as your favorite iPhone game, I’d be tempted to argue that you only feel that way because you haven’t played Traps n’ Gemstones.

Today, you can rectify that for just 99 cents.

Normally $4.99, the first full length adventure from Donut Games (makers of dozens of great shorter mobile diversions) is a fantastic mash-up of Metroid and Indiana Jones, tasking players to delve deep into the belly of a temple and recover 25 lost artifacts as they find new tools to illuminate previously darkened paths.

If you like old school, back-tracking platformers, Traps n’ Gemstones is the best that mobile has to offer.

The price drop is only for the iOS version (sorry Android), and will be available just for this week. If you haven’t played it, I can’t stress this enough — buy Traps n’ Gemstones while it’s less than a dollar.