[hermanhermitage]

This is an excellent observation. Might I also suggest that having some things closed or out of reach is also a fine way of encouraging people to dig in.

Some of the best young minds will search behind doors they are told not to look.

Its about getting the height of the hurdle just right!

[rwmj]

This actually happened on the ZX81: some very smart programmer reverse-engineered the ROM, ULA and display circuitry and worked out that you could implement high resolution graphics in software. Here is an interview with him:

http://jdanddiet.blogspot.co.uk/2012/02/crl-feature-extras-i...