On Source Engine 1 you would see mountains of ancient code that nobody understood anymore. No one human understood the whole thing. It was impossible. Adding major new graphical features to the engine without breaking the universe became enormously difficult.

||| code courtesy of the tf source leak |||
Music: Hall of the Mountain King
custom files --- https://pastebin.com/raw/e32aG4nP
[ hud / crosshairs / hitsound / killsound / gfx cfg ]

FAQ:
Q: How did you make that? What editing software do you use?
A: I use Adobe Photoshop, Premiere Pro & After Effects. Photoshop for image editing and thumbnails. Premiere Pro for compositing and After Effects for motion graphics (the fancy animations).