Na serveru Slunečnice.cz je zajímavá iOS aplikace:

Find it - train your brain 1.0

Find it is a simple pattern recognition app in which users try to find an image shown on two cards. Each card in Find it features eight different symbols, with the symbols varying in size from one card to the next. Any two cards have exactly one symbol in common.

Adresa: https://www.slunecnice.cz/sw/find-it-train-your-brain/