You could go with more hands on stuff like this if they have the aptitude or are old enough:
Kids - Badges, Books and Kits - Pimoroni
Young or old, big or small, this collection of kits, projects, and more will keep your little nippers occupied and help start their journey into the world of electronics and Making. Our Kids collection is a mix of fun, creativity, and learning. Build your own synthesizer, create electronic clay...shop.pimoroni.com
Its not games but making simple electronic gizmos.
Bookmarked this, it seems pretty good!