Circuit IQ

Two tiles go together when they match and a line can be drawn between them that turns no more than twice. The rule came out of a Japanese arcade cabinet in 1989. Circuit IQ is the rule rebuilt, and now it is two games in one app, a switch apart. COLOUR Tiles carry a colour and a mark, and a pair has to agree on both. Thirty-two boards across eight worlds, each with its own idea: plain, blocks, gravity, slide, columns collapsing toward the middle, rows splitting apart, shear. IQ Same rule, different tiles. Every tile is a figure: one of sixteen shapes, one of five fills, up to three side by side. Under the board sits a key that says what "match" means on this board, and the key changes every four levels: • Match — figures that agree in everything. • Cue — the key names one thing a pair must share, shape or fill or count, and changes its mind after a set number of pairs. • Code — digits…