Quite literally the only collectible you can get in the game.
There is no limit.
# 1
1529498 pieces
4 months ago
# 3
290321 pieces
4 months ago
# 5
127224 pieces
4 months ago
# 7
86946 pieces
4 months ago
# 9
31567 pieces
4 months ago
# 11
22558 pieces
about 1 month ago
# 13
11240 pieces
6 months ago
# 15
3310 pieces
4 months ago
# 17
1235 pieces
4 months ago
# 19
93 pieces
6 months ago
# 2
870586 pieces
2 months ago
# 4
151989 pieces
4 months ago
# 6
124826 pieces
3 months ago
# 8
50204 pieces
16 days ago
# 10
23787 pieces
17 days ago
# 12
20325 pieces
6 months ago
# 14
10009 pieces
about 1 month ago
# 16
2305 pieces
6 months ago
# 18
363 pieces
5 months ago