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SMWar (Super Mario War) is a fun fan-game that make the match 4 characters on a single map like smash bros but it's not quite like. There are multiple match types in the game, the classic one is taking each other lives. It be come with the level editor so you can make the map whatever you like for the SMWar. The map size is 20x15 tiles. (There is a version of the 32x24 tiles size, it called Super Mario War Stomp Area, it's Java based, but unfortunately it's so buggy, gets crash everytime.) The preview file is 640x480 a png file. If you want create a preview picture, push the insert on the level editor and check maps\screenshots directory, your map previews must be here.
like this;

The game works on Android, Linux, macOS and Windows but there's no the level editor on Android.
the 1.8b2 version of smwar level editor runs on even Windows 98. Thats a small thing.
file type: .map
max file size: 32kb
Allowed Versions: 1.8 Beta 2 to 2.0 2024-04-03 (do not use 2024-04-04 and above, it's full of buggy, i tried to suggettion about this bu no luck)
The Limitations: Use only the stock tilesets, which is Classic, Expanded, SMB1, SMB2, SMB3, SuperMarioWorld and YoshisIsland. There is a new stock tilesets on 2.0 2024-XX-XX but i think this shouldn't allowed, because only the ones I listed are included in 1.8 beta 2. You can change the tileset pages on the level editor with pgdown and pgup buttons. Maybe tilesets can be added to bit pack on the battles, I'm not sure about that. The tilesets files must be on gfx\packs\Classic\tilesets
For full information about the game, this video is a good example
edit:
You can download to game and current source code in here
btw this is my number 1 favorite fan game
edit 2:
daym, there is already the lyceum of SMWar
SMWar lyceum
like this;

The game works on Android, Linux, macOS and Windows but there's no the level editor on Android.
the 1.8b2 version of smwar level editor runs on even Windows 98. Thats a small thing.
file type: .map
max file size: 32kb
Allowed Versions: 1.8 Beta 2 to 2.0 2024-04-03 (do not use 2024-04-04 and above, it's full of buggy, i tried to suggettion about this bu no luck)
The Limitations: Use only the stock tilesets, which is Classic, Expanded, SMB1, SMB2, SMB3, SuperMarioWorld and YoshisIsland. There is a new stock tilesets on 2.0 2024-XX-XX but i think this shouldn't allowed, because only the ones I listed are included in 1.8 beta 2. You can change the tileset pages on the level editor with pgdown and pgup buttons. Maybe tilesets can be added to bit pack on the battles, I'm not sure about that. The tilesets files must be on gfx\packs\Classic\tilesets
For full information about the game, this video is a good example
edit:
You can download to game and current source code in here
btw this is my number 1 favorite fan game
edit 2:
daym, there is already the lyceum of SMWar
SMWar lyceum