Cool
I added Behind the mirror to the list.
In 2 player Janggi the guards must stay in the fortress, so do you want the non royal pieces in the fortress to be kings, or wazirs so that they stay in the fortress?
I think the walls in Storming the Castle, being on one side of the board while Red and Green have jumpers probably favors Blue and Green, and I noticed that Red and Green seem to win most of the games.
I introduce 3 new variants I was thinking of.
Please, I ask the admins to review the games and modes and say what can be improved and did the like in a game or no, what did the like and what they did not like.
4 Player Janggi

Screenshot:
Rules:
Suggested time control:
1|2D ( bullet )
FEN4:
R-0,0,0,0-0,0,0,0-0,0,0,0-0,0,0,0-0-{'royal'
3,yR,yG,X,yW,1,X,yG,yR,3/
3,yβ,yN,X,yK,yK,X,yN,yβ,3/
4,yβ,yI,X,X,yI,yβ,4/
bR,bβ,3,yβ,yβ,yβ,yβ,3,gβ,gR/
bG,bN,bβ,8,gβ,gN,gG/
X,X,bI,bβ,6,gβ,gI,X,X/
1,bK,X,bβ,6,gβ,X,gK,gW/
bW,bK,X,bβ,6,gβ,X,gK,1/
X,X,bI,bβ,6,gβ,gI,X,X/
bG,bN,bβ,8,gβ,gN,gG/
bR,bβ,3,rβ,rβ,rβ,rβ,3,gβ,gR/
4,rβ,rI,X,X,rI,rβ,4/
3,rβ,rN,X,rK,rK,X,rN,rβ,3/
3,rR,rG,X,1,rW,X,rG,rR,3
Links to played games:
https://www.chess.com/4-player-chess?g=3346461
https://www.chess.com/4-player-chess?g=3346152
https://www.chess.com/4-player-chess?g=3340008
https://www.chess.com/4-player-chess?g=3339571
Behind the mirror:
Screenshot:

Rules:
Suggested time control:
1|5D
FEN4:
R-0,1,0,1-0,0,0,0-0,0,0,0-0,0,0,0-0-{'royal'
3,yR,yB,yN,yQ,yK,yN,yB,yR,3/
3,yP,yP,yP,yP,yP,yP,yP,yP,3/
14/
1,X,X,8,X,X,1/
1,X,1,rP,rP,rP,rP,rP,rP,rP,rP,1,X,1/
2,X,rR,rB,rN,rQ,rK,rN,rB,rR,X,2/
1,X,X,X,X,X,X,X,X,X,X,X,X,1/
2,X,X,X,X,X,X,X,X,X,X,2/
1,X,X,yR,yB,yN,yQ,yK,yN,yB,yR,X,X,1/
2,X,yP,yP,yP,yP,yP,yP,yP,yP,X,2/
1,X,10,X,1/
14/
3,rP,rP,rP,rP,rP,rP,rP,rP,3/
3,rR,rB,rN,rQ,rK,rN,rB,rR,3
Links to played games:
https://www.chess.com/4-player-chess?g=3424852-0
https://www.chess.com/4-player-chess?g=3424839
https://www.chess.com/4-player-chess?g=3421754
https://www.chess.com/4-player-chess?g=3421710
https://www.chess.com/4-player-chess?g=3420749
https://www.chess.com/4-player-chess?g=3420574
https://www.chess.com/4-player-chess?g=3420533
https://www.chess.com/4-player-chess?g=3420465
https://www.chess.com/4-player-chess?g=3420417
https://www.chess.com/4-player-chess?g=3420402
https://www.chess.com/4-player-chess?g=3420346
Storming the castle

Screenshot:
Rules
Suggested time control:
1|15D
FEN4:
R-0,0,0,0-0,0,0,0-0,0,0,0-0,0,0,0-0-
3,X,bK,1,bQ,yQ,1,yK,X,3/
3,X,1,X,X,X,X,1,X,3/
3,X,X,1,bB,yB,1,X,X,3/
X,X,X,X,X,bN,X,X,yN,X,X,X,X,X/
bR,2,X,bB,bN,X,X,yN,yB,X,2,yR/
bR,X,10,X,yR/
X,X,X,X,X,X,yP,yP,X,X,X,X,X,X/
X,X,X,X,X,yP,yP,yP,yP,X,X,X,X,X/
14/
14/
3,rγ,rγ,rγ,rγ,rγ,rγ,rγ,rγ,3/
14/
3,gM,gH,gE,gY,rY,rE,rH,rM,3/
3,gK,gM,gY,gN,rN,rY,rM,rK,3
Played games:
https://www.chess.com/4-player-chess?g=3353388
https://www.chess.com/4-player-chess?g=3353224
https://www.chess.com/4-player-chess?g=3348910
https://www.chess.com/4-player-chess?g=3348722
https://www.chess.com/4-player-chess?g=3348698
https://www.chess.com/4-player-chess?g=3348287
https://www.chess.com/4-player-chess?g=3348197
https://www.chess.com/4-player-chess?g=3346792
https://www.chess.com/4-player-chess?g=3346720-19
Please, I ask the admins to review the games and modes and say what can be improved and did the like in a game or no, what did the like and what they did not like.