Hehe the guessing game was my fist too, way before I even had a computer.
I think what we have lost from the old 8-bit computers and their BASIC, was the ability to instantly have something show on the screen, like the classic Sinclair Spectrum spider web:
10 FOR n=0 TO 31
20 PLOT n*11,0
30 DRAW -n*11, 175-n*8
40 NEXT n
(or something like that) That stuff got me hooked.