Flash games for school websites

As some of you may know I look after a few primary school websites. Does anyone know where I can get free games for these sites as the children are starting to ask for them and one of the schools has ofsted in next month.

The requirements are:

Flash based

Low filesize (we're talking rural villages so dialup is still common)

Suitable for children from 4 upwards.

Must not cover anything contentious

Must not contain advertising

I realise this might be an impossible task but I thought it might be worth a try.

Thanks in advance.