Snap Circuits Jr. look more 5+? My cousin has that, and likes it, but he is well into school.

I found backgamon to be fairly complicated and never really got my kid to play anything abstract, closest I got was with Hive, but that quickly devolved into stacking cute little bugs on hexagons into stacks (not that I am complaining)

It either needs to be fast, reflex games like Hali Gali, Dobble, e.t.c. work well, or with interesting enough theme, i.e. she actually likes to attempt to build a giant sprawl in Carcasone :D

But I will definitely check out robot turtles :)