二行程機車汰舊換新補助

Froggy Math

Winner of the National Science Foundation's "Student Award for Excellence". Who says learning can't be fun? With Froggy Math, children (and adults) ca...

jSUDOKU Free

The puzzle consists of the grid 9x9 and 3x3 box. In some regions, the numeral is given in the grid. The objective is to fill one digit in blank cells ...