3 A Game of Patience
The pleasure when a game of Patience begins to come out arises from the fact that one good fit opens the possibility of another good fit, and so on in a cascade.
4 Jigsaw Puzzles
This is one of the simplest examples of 
.
You think the second piece will fit onto the first, you try it and Bingo!
After you have found one sock from a pair, finding the second sock is a similar moment, isn't it? --- simple and enjoyable, Got it!