In German two-digit numbers the ones come first: 47 is siebenundvierzig (seven-and-forty), not vierzigsieben. In each round you see a number and choose its correct German spelling from four options. The wrong options are typical mistakes: the English word order, misspellings such as sechszehn or siebenzig, and nearby numbers. After every answer a short note explains the rule. Numbers are shown in German format, with a period as the thousands separator (1.000 = 1,000).
A1 practices selected numbers up to 20, the tens and 100; A2 practices two-digit numbers from 21 to 99; B1 adds hundreds, thousands and years such as 1998 (neunzehnhundertachtundneunzig). There is also a mixed level. A round has up to 10 questions, and you have 3 lives. The game is free, needs no account and keeps your progress in your browser.