1-) Run Rimworld; 2-) Press the “Options” button in the main menu; 3-) Under Gameplay, the middle column, tick “Development mode”. Now that Development mode is activated, create a new world and colony and test your mod: 1-) Create world; 2-) Create a colony, probably on Free Build difficulty; 3-) The following icons: can now be found in the top-right; 1-/ Open the debug log = Clicking this opens the debug log; 2-/ Open the package editor = Opens the package editor, which allows you to preview and modify Sounds and Hair; 3-/ Open the view settings = Allows you to activate graphic overlays and cheats like Fast Research; 4-/ Open debug actions menu = This menu allows you to do all sorts of things; Incidents allows you to spawn in raids or execute incidents; Actions – Misc contains a few buttons that complete research, continue the in-game tutorial, etcetera; Tools – General contains explosions and damaging things, snow actions, plant growth and some more advanced AI visualizations; Tools – Pawns holds tools which alter Pawn appearance, levels, health and jobs; Tools – Spawning allows you to spawn Pawns, Items in different stack sizes, Terrain and Filth; Autotests contains some stress tests like spawning in an entire colony in different stages, burning everything and killing lots of pawns at once. 5-/ Open debug logging menu = Contains buttons which log parts of the game in the Debug Log; 6-/ Open the inspector = Gives a lot more information when hovering over things; 7-/ Toggle god mode = Toggles God mode, which allows you to build things without cost; 8-/ Pause the game when an error is logged = Toggles exactly what it says.