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Super Mayhem Boxes

Super Mayhem Boxes, is the classic multiplayer gamemode created by JetBoom for NoXiousNet in 2008. You play as a smiling box on various retro game themed levels and attack the enemy for massive damage. This addon is v1.2 ported to GMod 13, complete with 27 maps to duke it out on.

Original description:

• Two teams in a 2D battleground. Use the weapons and powerups or stomp on their head to defeat other players. Complete the objectives for whatever gametype you're on. Currently there is Capture the Flag and Coin Collector.
  
• Easy to learn. Just join and play and let the physics do the work.
  
• Almost everything is physics-based. Use the fan weapon on the flag to make a hot air balloon, stomp on people jumping across a gap to make them fall to their death, and even grapple hook on to a rocket.
  
• Tons of weaponry and powerups. Lots of physics-based ones like guns that shoot physical bullets, bazookas, grappling hooks, jetpacks, etc.
  
• Easily create or download new gametypes, weapons, and powerups. Plug and play, drag and drop.
  
• Tons of top-quality (some old classics too) custom maps are already made.
  
• Custom entities make it easy to create interactive maps in Hammer. Anything from a on-use door to a flying carpet and rideable animal.
  
• Old maps are never left in the past when new weapons or powerups come out. Simply use the Tier system to set a powerup to a certain Tier. Any weapon or powerup in that tier will be randomly given to the person picking it up.
  
• Multiple planes. Movement limitation is mostly handled in Hammer so you can create foregrounds, backgrounds, dungeons, or even crossroads.
  
• Comes with a stripped version of the NoXiousNet map voting system.

Original Facepunch thread https://web.archive.org/web/20160811233854/https://facepunch.com/showthread.php?t=791985

I took just the pack loading code from here (I only discovered the repo after finishing my port): https://github.com/babbe107/super_mayhem_boxes

Additional controls:
Shift+W/S: Zoom in / out
Alt: Squint