What are some good typing games for kids?

I am a Educational assistant working with kids with special needs and as part of their program they are learning to use a computer for notes and tests and such. i am having trouble getting their typing fast enough to make the computers useful. i think if they could play games it would be more fun and possibly easier. these kids are in grade 3 and 4. i need the games to be online and free to play without a subscription of any type.|||Here are some free online typing games





http://www.bbc.co.uk/schools/typing/





http://www.tldsb.on.ca/Schools/Grandview鈥?/a>





http://funschool.kaboose.com/fun-blaster鈥?/a>





http://www.powertyping.com/





http://www.columbia.k12.mo.us/dre/drelmc鈥?/a>|||I have heard that a program called Mavis Beacon helps.