Discworld

This is my favourite game of all time and if u are a disc world fan you will love it.The puzzles don't make sense so you have to combine every item with everything to work them out.The characters and the humor are good though and features Eric idle Rob brydon and tony Robinson for the voice acting.Classic 90s point and click

Astonishing ambient, puzzles and humour are on the edge of imagination (and sometimes are over the edge). Each location is fresh and hilarious and surprising art with soul.

Unfortunately, some puzzles are too random and almost unsolvable. Without walkthrough, they will require wasted days.

And yet, it may be worth to try to have a coop play with friends, but without checking spoilers and easy solutions at all.

May be about 3 actions during the game are too hard to figure out in any way - the choice is 2-3 wasted days on each of them or checking UHS.

As in the title, I'd nominate Discword, possibly whole series 1-2-3 (Noir) for the best game ever created. Somewhere near Portal and Planescape (and may be some other).