Odd One Out

For grown-ups

Ten questions a sheet, three boxes each, tap the one that does not belong. Easy mixes very different things (two fruits and a car); Medium keeps them in one big group (two land animals and a fish); Hard and Super use numbers and a rule such as even and odd, multiples, squares and primes, and each question has only one answer, checked by the program. It practises sorting, categories and number sense.