This is an online grammar game that I have found out through Patricia Pérez, from The English You Need blog.
It is good reading practice and good grammar revision of the irregular verbs in English with varying degrees of difficulty, but it is specially suitable for lower level students, Básico 1 and Básico (elementary).
You can play on your own or two people can play together, with what we can add a nice touch of competition to the game. We can also select the difficulty, ranging from easiest (100) to most difficult (500). The verbs are separated in groups, according to the first letter of the infinitive.