Threes! is a numbers puzzle game that costs $1.99 and has zero in app purchases.
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Pros
Pro No time limit to solve the puzzles
There's no time limit to force the issue, but that doesn't matter, because it's so damnably slick to both the touch and the brain that you'll throw moves out with the same speed and grace that climbing into a tiny boat forbids.
Pro Ideal for phones
Being a portrait style game that has large graphics that are meant to be played with one hand, Threes! fits better on a smaller screen device such as phones more so than a tablet.
Pro Pick up and play
A puzzle game should be quick and easy to pick up and play, but deep and challenging enough that it’s difficult to put down - that’s the cliche ideal. Threes is the embodiment of that ideal.
Pro Rewarding
The sense of reward one feels as title are combined makes for a very enjoyable game, no matter how many times it is played.
Pro Easy to learn, hard to master
Pro A free version is available
A free, ad-supported version was released on June 10, 2015 and is available here.
Pro Gameplay suits anyone's style
Threes! can suit anyone's play style, whether it is someone who takes their time and considers all option or someone who just blazes through each move without much forethought.
Cons
Con Randomness of game can be frustrating
The randomness of what new tiles appear can be frustrating when nothing is lining up very well.