Eights! vs Collatz Hailstone Link

The game starts by showing you a random set of numbered tiles spread across its 4×4 board. Your task is to merge/join the numbers. 5 can only match with a 3 to create an 8. 5 + 3 = 8 any number higher than 5 can match with itself 8 + 8 = 16 16 + 16 = 32 ... Match higher numbers to get your high score. ------------------------------------- Game mechanics: In order to merge the tiles you need to push the tiles to the wall. Simply swipe using one finger to any four directions (up, down, left, and right) and all free tiles will move along. Thus, you may be moving more than one row or column at a time, and you may trigger more than one merge in a single action. After each move, the game will place a new tile in an empty space left behind by the action. It is important to remember that the space on the board is limited, and the game ends when you can no longer move. Hence, you must manage the free spaces. I recommend planning for a move that will free two or more spaces with a single action. ------------------------------------- simple rules, intuitive gameplay, and difficult to master

Collatz Hailstone Link — a relaxing number-merge puzzle built on one of math's most famous mysteries: the Collatz conjecture (the "3n+1" problem). Drag and merge numbered tiles, watch each sum bounce through the hailstone sequence, and chase the highest — or lowest — final number you can reach. Easy to learn in seconds, deep enough to keep you coming back for a better score. HOW TO PLAY • Drag one tile onto another (or tap one, then another) to merge them. • The two values are added, then the Collatz rule is applied to the sum: - Even sum → divide by 2 (the tile turns blue) - Odd sum → multiply by 3 and add 1 (the tile turns orange) • Chain the same color in a row to build a streak bonus. • Keep merging until a single tile remains. Push that last value as high — or as low — as you can! FEATURES • Pure one-finger gameplay — merge with a drag or a tap. • 7 board shapes: Square, Hexagon, Triangle, and four hybrid layouts. • Three-part scoring: turn points, streak bonuses, and a final bonus based on your last number. • Undo your recent moves to plan the perfect chain. • Records screen — sort your runs by score, max value, final value, and date. • Global online leaderboards — compete on both High Score and Final Max. • Light & Dark themes. • English & Korean language support. • Play offline, anywhere — no account required. WHY YOU'LL LOVE IT A quick puzzle for a coffee break, a brain teaser for math lovers, and a satisfying score-chaser for everyone in between. Every board is a fresh little puzzle in number theory — no two runs feel the same. Merge the numbers. Ride the hailstones. Beat your best.