Here's an example gamemode with custom scripted weapon - Cannonball!
Usable for FFA (mp_teamplay 0) or as base for other scripted weapons or modes.
https://github.com/Alienmario/custom...nball_gamemode
After installing type !cannon to start the cannon-only gamemode. Type it again to end it or wait until the map ends.
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Also, since first post, the main plugin has been updated with many fixes and features so make sure you have the latest version!