Crossmath Challenge

Crossmath Challenge borrows the shape of a crossword and fills it with arithmetic. The grid holds equations that read across and down, each with gaps in it, and a tray of number tiles waits at the bottom of the screen. Your task is to put the right tile in each empty cell so that every equation works out.

As in a crossword, a cell where an across line meets a down line belongs to both, so the tile you place there has two sums to satisfy.

Tiles can be placed in two ways: pick one from the tray and then choose a cell, or drag it straight onto the grid. Three buttons support the solving. Undo takes back your last placement, Shuffle reorders the tiles in the tray, and Hint fills a cell for you, though the instructions say its use is limited. The developer pitches the game as fast-paced, simple to pick up and tricky to master.

Choose a number tile from the tray along the bottom with a tap or click, then tap the empty grid cell where it should go. Dragging a tile straight to its cell works too. Fill the gaps so the equations work across and down. Undo removes your last placement, Shuffle reorders the tray, and Hint fills a cell for you a limited number of times.

A tile placed where an across equation meets a down one has to make both of them work, so check it against each before moving on. Undo removes your most recent placement, which makes it easy to test a tile and take it back. Hints are limited, so spend them on a cell that is holding up several equations.

An arithmetic puzzle on a crossword-style grid, in a landscape frame. Tiles are placed by tap, click or drag. Undo, Shuffle and a limited Hint are the tools listed, and the developer describes the pace as fast.

Math is easy! also tests whether you know what an expression equals, by pairing expressions with answers. Stickman Mental Math has you build equations of your own from numbers and signs to hit a target.