chess variants know them all !

1.bughouse 

2.crazyhouse

3.horde

4.duck  chess

5. 4 player chess 

6. 4 player chess old standard 

7. racing king 

8.king of the hill 

9. fog of war 

10. giveaway 

11. atomic 

12. setup chess

13. 4PC max 

14. chaturaji 

15. blindfold

16.XXL chess 

17.tic tac toe 

18.king safety

19.bYG setup

20.war for the throne (my favorite)

21.seirawan chess

22.gustav's box

23.amazon jungle

24.mini forest 

25.thermopylae (I am good at this )

26.chaturanga

27.gothic chess

28.chess 960

29.labyrinth 82

30.grasshopper arena 

and lot more than you could think , there  are like 1000+ types of board setups you can play , off course 960 tyes of chess 960 , 960 types of 4 player chess etc .