Free games for your pupils to use

Pupils will use any games available on the net so adding educational ones is a surefire winner.

Teachers can add games to free software moodle program as follows:

So far the only way I have found to do this is:

1) Make a fling the teacher (I like free software and it is all I will use at home on principle!) game
2)post it to a website. For example atspace will allow ad-free websites and it has to be ad-free (see point one)
3) upload it as a link to moodle in this case http://learning.sackville.w-sussex.sch.uk/

There really ought to be an easier way!