Educational games have come a long way from Math Blaster (actually, Math Blaster itself has come a long way from how I remember it). For one thing, instead of being played on oversized desktops in the elementary school computer lab, they're now available on smartphones.
One of the cleanest, least cheesy and most aesthetically appealing of the current crop of education apps is Simple Machines, which teaches kids basic physics principles through experimenting with simple machines.
There's no winning, score, or even end game, which seems to be a divisive issue among parents. Some don't like that there's no "goal" but other praise the game for encouraging "tinkering."
[h/t Laughing Squid]