9 Most Satisfying Simulations (Every Hit Swaps Two Tiles) 🌈

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Photosensitivity: no full-screen flashes (measured frame by frame). Small patches under 3% of the screen flicker briefly where tiles, cards or marbles swap places, mostly at 0:02–0:32, 3:30–4:06 and 5:36–6:08.
No talking, no voice-over: only the simulations and their sound.
Each chapter shows its title on screen, then runs until its picture is finished. No cuts inside a chapter.

256 shuffled tiles sit on a 16 by 16 board. A white ball hops across a pale board to the nearest tile that is out of place, and every hit swaps two tiles: that tile and the one sitting on its home square, so each swap sends at least one tile home. After 248 swaps the board is one rainbow, red in the top-left corner to violet in the bottom-right.

Then: 255 marbles count to 11111111 through eight binary rockers; a ball of 143 rainbow pixels sheds one pixel at every bounce, and each pixel flies into the wall with its own note until all 144 wall cells are filled; robots set 360 eggs into a size gradient; 240 panes of glass seat into a rose window; 8 perfect shuffles bring a 52-card deck back to new-deck order; 240 sushi plates sort themselves into eight rainbow columns; six heads press 2,304 studs into a sunset; and 1,000 numbered marbles sort digit by digit in 3,000 drops.

The number under each chapter title is the simulation's own count in that frame.

What is exact and what is paced? The tile board is not a textbook sorting algorithm: the ball simply goes to the nearest misplaced tile, and its hops are timed so the last tile lands on schedule. The faro shuffle is exact: a perfect out-shuffle moves the card at position p to 2p mod 51, and 2^8 = 256 = 1 (mod 51), so 8 shuffles return every card. The marble sorter is a real least-significant-digit radix sort, and the marble adder is a real binary counter. The pixel ball's bounces, the sushi belt, the egg robots, the sunset gantry and the rose window follow timetables so each picture finishes on time. The rules, the code and the sound are all original.