Valgetal ("falling numbers" in Dutch) is an educational falling blocks-style math game with 20 progressively difficult levels for addition, subtraction, multiplication, and division. It's a clever twist on mathematical games and lots of fun. To advance a level, you must complete basic equations by controlling the placement of falling blocks into a container. If you're playing the addition levels, for example, and you place a 4 block on top of a 9, you'll need to place a 13 block on top of them to score. The game adjusts as you play to include the appropriate answers in the falling blocks. You'll need a particularly nimble mind to succeed in the upper levels as the blocks descend with increasing speed. You can display the interface in English, Dutch, Frisian, or Spanish.