non-computer /card games for a 10 year old boy

[ospreychick]

Hi,
My 10 year old stepson has just moved in with us, and we want to expand his toys here. He's not sure what he wants as he mainly matched tv and played on the computer at his mum's. He has lots of card games (Chaotic, Yu Gi Oh), but we're looking for things he can do on his own when I'm tied up with the little ones (aged 2 and 6 months!!). He's very good with practical things, so maybe something with circuit boards or construction would be good. Any top tips greatly appreciated! Thanks.

[Chamomile]

What about Warhammer? Might be messy though.
Jigsaws? I spotted a range of 300 piece Horrible History puzzles on Amazon which looked good. We have this John Adams electronic set and it's really good.