German Irregular Verbs

Interactively practice german irregular verbs by playing tic-tac-toe with both "Präteritum" and "Perfekt" forms. Give a correct answer to place your mark into the board.
As the game's rule: Who marks a line or diagonal first, wins.
The app comes with a list of verbs at A1 and A2 levels. You can also choose to add verbs at other levels (B1-C2). Moreover, you can also add and modify the list your self. In the 'Word List' interface:
- Use button 'ADD' to add a new word.
- Use search bar to look for an Infinitiv word.
- Long touch a word to edit or delete.
- In the three-dot-menu, you can add pre-initialized words at all levels (A1-C2).
It is best to play with somebody :).
P/s: Initially I decided to make this app for myself. However, I think some other people might find this helpful as well. That is why I am sharing this app.