Practice
Practise as long as you like
Choose a set and a level. Every exercise is new, checked straight away, and has a hint and a worked solution.
No points and no leaderboard. Get five exercises right in a row on a level and you get the "Found" stamp. It is kept on this device only. The exercises are a draft until a history teacher has reviewed them. You practise the first three skills for free; the other sets are part of Kaft Plus.