Number Rumba

The game box contains 2 identical little stands each with 9 number blocks and a pack of example-cards.
The cards are numbered from 1 to 24 (easy..difficult).
When a card is placed on the table, the 2 players try to make the example witch is shown on that card as quickly as possible.
The fastest player wins that card.
Then the next card comes on the table etc.

Rules: You may just move one block at the time and the stones may only be put on the bars of the stand.
Not in your hands or on the table!!
Each bar can have 3 blocks max.

It's also a nice game to play for 1 player.