Stack-Up is the second entry in the two-game Robot Series (designed to be used with R.O.B., the first being Gyromite). While Gyromite could be bought by itself or in the NES Deluxe Set, Stack-Up was only ever sold by itself, which makes complete copies quite rare.
Bizarrely, like Gyromite, most Stack-Up cartridges merely contained a copy of the Famicom's Robot Block with an adapter so it could work on the NES.
Present at 0x10 is what appears to be not only a build date, but a very special day:
Programed by T.NAKAMURA 6/24 is my birthday. 1985/6/24 TOMOYO chan ROBOT 1 1985/6/24
Another message at 0x7FB0, which also appears in Gyromite, seems to be the build date of the sound engine:
ROBOT SOUND 5/5 1985 HIROKAZU.TANAKA