From GameBrew - a wiki dedicated to Video Game Homebrew.
Matecedario (Spanish) is a DS homebrew maths game, based on the TV game show The Numbers and Letters, where you will have to play against an AI. The game is in Galician and Castilian.
Matecedario is a game where it tests the skills of the contestants by solving Mathematics and Language problems in 60 seconds.
You can choose between two levels, one easy and one more difficult.
Stylus - Play
A - Reset test
Start - Start over
Tested on DSTT/TTDS (firmware 1.17).