Mission Editor

OpenChaos has a full mission editor built in. Open it with Shift+E, or Esc then Mission editor, while playing any mission. It works best in the Mac app, where saved missions go to a folder on your computer.

Making a mission

File → New mission: a name, a size (8 to 256 tiles across) and a theme from any retail mission. Or File → Open to change an existing one.
Terrain: pick a tile (right-click on the map picks the one under the pointer), an orientation and a brush, then paint. O shows where units can walk.
Place your team, dinosaurs, hunters, buildings, crates, eggs and markers from the other tabs.
Rules → Objective: choose one of the 15 mission types. The panel lists what that type needs, shows what is missing and jumps to the right tool.
T lets the autoplay bot try your mission; P plays it yourself and comes back to the editor.
Ctrl+S saves it into the level list. File → Build mod packs it into a mod archive.

Ctrl+Z / Ctrl+Y undo and redo (40 steps).

Tabs

Tab	Places
Terrain	paint tiles from the mission's tile sheet, walkable / blocked / slow ground, trees and nests
Team	start slots and named characters, including one to rescue
Dinos	any species, wild, yours or hunter-owned, alone or in packs
Hunters	scouts to tanks, hunter camps, sheds and hunter nests
Buildings	your structures, broken bridges, fences and captive pens
Items	supply and equipment crates, egg piles, TNT plungers, the baby T-Rex
Markers	goal zones, hangouts, grazing spots, hunting trails, spawn sites, airdrops
Rules	objective, next mission, supplies, recruit points, team, buildings allowed, aggression, spawns
File	save, export, validate, test with the autoplay bot, play-test, new or open mission

Mission types

Missions reuse the game's 15 built-in objective scripts, such as: build a camp and rescue someone (Mission 1), repair a bridge and reach the dock (2), fire barriers and compys (3), destroy the jeeps (4), herd dinosaurs (5), free captives (6, 7, 9), reach a zone (8, 11, 12), escort Eddie (10) and the San Diego T-Rex run.