Almost all of my students of 3rd and 4th of ESO were also my pupils when they were 5th or 6th Primary students. Then I taught them some ICT contents, like creating their first email address, sending some emails, working in the virtual school... and sometimes I showed them some online games (always in English!)... their favourite was "Bloxorz", and I remember how we were absolutely hooked to that game. It consists on getting a block off a hole by using our spatial and mathematical abilities and using only our brain and the keyboard arrows.
Do you feel like playing a game? Do you remember the level you achieved? Here you are one of the online websites where you can play a Bloxorz game again :)