you should play la-mulana
A lot of them were there to occupy time to give the game more longevity and weren't necessarily the good kind of challenge. The LucasArts point-and-click stuff was pretty crappy in this way
Play Shenzhen I/O or TIS-100. Pretty difficult puzzle games. But that's obviously not what you mena :P
At this point I have to wonder why not just go the full way and get a degree in electrical engineering
they had to be nerfed or removed entirely because of video game journalists
When point and click died it took them with it.