The Development Project is a HL2 modification made out of manipulated Dev textures as a project for those that enjoy the simplicity of the original measuring textures created by valve scattered throughout the map but also enjoy all the effects, adventures and creativity of regular mods.
Hopefully the last update to this puzzle of which shows new models, textures, map interaction and much much more.
The last puzzle remind me of Half-Life, which is good.
Thank you, I have actually tried to keep them simplistic for the old hl players actually.