The sign of a very good game is one that makes you say “just one more”. The most addictive games in the industry all had this going for them: How many times have you said you would play just one more game of Modern Warfare? Civilization? Complete just one more quest in World of Warcraft? Temple Run might not have the deep gameplay appeal of those video game classics, but it has their addictive qualities in spades.

Temple Run is an endless runner game created by Imangi Studios. Just like many other endless games, you don’t get a deep story or anything like that. You start the game by taking a monkey statue, which makes some monkey-like creatures really mad at you. They’re coming for you. You can run, but you can’t hide. So you start running, and running, and running.

Just like you would expect from these types of games, your goal is to run as far as you can. The farther you go, the harder it gets. You have to jump, slide and tilt your way through several obstacles that are coming your way. If you fall or run into an obstacle, or if you slow down enough for the monkeys to get you, you lose.

If you lose your run, Temple Run gives you the option to play an ad to continue where you died. The ads might get annoying, but this is a great feature if you’re on a good run and just made a small mistake. The bad part is that, if you decide to not watch the ad to continue playing, you’ll still have to watch an ad to restart the game.

I don’t know if it was just me or what, but if you’re gonna give the player the choice to watch an ad, you should at least respect the player’s choice.

Along the way, you’ll also get coins. These coins are optional, but you can use them to buy different items, characters, and power-ups at the store. Temple Run also has objectives. These are small tasks that, for the most part, are not that difficult. Most of them are about running and scoring points.

There are also leaderboards for you to compete with other players around the world. And, once you start playing, you can see where other players die. It’s a neat little feature that keeps the game competitive and replayable.

Perhaps the best part of the game is its price-tag: free. Even better, it is currently completely ad-free (though I can’t imagine that’s going to continue, given the games popularity). This is a game that you will likely be playing for quite some time, and to offer it for free actually makes me feel bad that they didn’t charge $0.99 for the app—even at that price it is a steal. All told, if this game isn’t on your phone, you’re doing yourself a huge disservice.