R.O.B? That hunk of junk is even more useless than the virtual boy. I would know because for XMAS '88 I was given a NES package with ROB, Stack-Up, Gyromite, and Duck-Hunt.
Aside from Duck-Hunt, the other two games were garbage. Gyromite was mildly fun with a buddy, and Stack-Up was virtually unplayable. To this day I still couldn't figure out how to play Stack-Up, and I read the manual front to back a million times.
I sold my R.O.B set for hefty $306 on ebay in 2002. Good times.