The Thousands

Sudoku is something old people do on the train. Tetris, while still a classic, has started to show its age and comes across quite clunky on the iPhone. Drop7 is an expert melding of the two in a crisp, stylish new wrapper. Your goal is to drop randomly generated numbered balls into a grid, which disappear when put in a line that matches their value. Added to the mix are grey balls that must be touched by cleared balls to expose their hidden numerical value. A row of these grey balls is added as you use up the number of balls you have for each stage. **As with traditional puzzle games of this type, the satisfaction comes from elaborate chains you engineer both intentionally or, in my case, by accident. The gratifying pop as line after line shifts following a clever drop drives you on, along with the option to instantly post and compare scores with Facebook friends. Don’t let the numbers and grids put you off – a quick spin of the free demo and you’ll be hooked.