Speaking of the number 3, that's how many installments are now available for the gorgeous, award-winning, touchscreen-puzzling The Room series. The Room Three is 'coming soon' to Google Play.See The Room Three in Apple's App Store for $4.99.See The Room Two in the Google Play store for $1.99.See The Room Two in Apple's App Store for $1.99.See The Room in the Google Play store for $0.99.See The Room in Apple's App Store for $0.99.Then, if you like what you see there, you can buy the first version for endless puzzling with no ads, no in-app purchases and no little banners popping up asking you to 'please rate the game' every five minutes. Its original version is a 'buy once and play' experience, earning its listing here, but there's also a 'Threes! Free' edition supported by ads if you first want to dip your toes in its waters to try it out for no money down. In addition to being sensational in gameplay and value, Threes! also presents the power of choice when it comes to your spending. Your goal is to combine number cards with others of their same value so they merge and keep doubling up – two 12s stacked together become a 24, two 24s become a 48 and so on – but it takes a lot of thinking ahead to be able to get the right cards into the right positions, as new cards are constantly be adding to the mix as you make each new move. Its gameplay defines both simplicity and complexity, as good puzzlers should: swiping the screen up, down, left or right is your only input (and you can take as long to make a move as you like), while the strategic thinking that informs your swipes is what makes things tough. Threes! is to mobile what Tetris was to Nintendo's Game Boy 25 years ago – the go-to puzzler that everyone should own. Threes! has already been downloaded by millions and likely played for days on end by those same millions, but if you've missed grabbing it so far, it's time to right that wrong. The ideal 'buy once and play' experience must certainly be a game with a cheap entry cost up front, but with almost endless replay value – and luckily, we were graced with just such a game last year.

See it in the Google Play store for $2.99.No microtransactions here! These are the best games you can buy and fully play, without fear of being nickel-and-dimed – the best 'Buy Once and Play' mobile games. We hear you, friends, and so we've compiled this list of excellent non-freemium options for you.

Mobile spades app