Azul is the game I recommend when someone asks for a beautiful abstract that plays quickly and creates real tension. The tile-drafting and placement puzzle is elegant without being complicated. You can teach it in five minutes, play a full game in forty-five, and the experience at the table is consistently satisfying regardless of player count.

Stained Glass of Sintra changes the line-clearing mechanic significantly — tiles now fill columns instead of a grid, and the overlap calculation is replaced by careful column management. It is a different puzzle. Some people prefer it, I find the base game more elegant.

Summer Pavilion is my personal favorite of the three. The colored tile bonus mechanism and the mandala pattern create a scoring puzzle that rewards long-term planning while still generating interesting decisions every turn. If you own the base game and want more complexity rather than just more of the same, Summer Pavilion is the direction to go.