Here are some grammar games for you ( Choose the right alternative and the game counts your points ! ) :
The infinitive game : http://www.quia.com/pop/6747.html
Choose the right case : http://www.quia.com/pop/2708.html
Question words: http://www.quia.com/pop/6518.html
Postpositions: http://www.quia.com/pop/2706.html
To play : pelata, soittaa vai leikkiä : http://www.quia.com/pop/3503.html
Osata, voida : http://www.quia.com/pop/3502.html
Plural case practices : http://www.quia.com/cb/4380.html
Yes, I have posted these links before but it was a VERY long time ago.