In case anyone need rules:
To score you need to collect identical tiles (sets of 3 or 4, 4 tiles reward more points)
But you also need to end game with 14 tiles. It mean you can have 3+3+3+3+2(pair).
The main difficulty is to remember what was wasted and what pair or set you can find at the end.
The game can offer you to collect sets with numbers that follow in order, but you can use it only to finish your tiles faster. No points awarded for this. (3,4,5 / 1,2,3 / 2,3,4)
Only bamboo, number and ball tiles award points. Other tile combinations are bonuses that can double points.
here is an example of 3+3+3+3+2 combination. There are many combinations you can learn, but those look up in google.
Almost forgot the most important thing. You are also awarded double points for hiding your sets and pairs, for not stealing tiles from the table. Double points for hidden sets and pairs.