Collatz Hailstone Link vs Prism Expanse

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.

Match energy. Restore the stars. The Expanse has gone dark. Derelict stations, silent reactors and rifts in space wait along a route that stretches across thousands of levels. Swap neighbouring energy pieces to line up three or more, and bring each region back to light. MATCH, CASCADE, OVERCHARGE Every swap can set off a chain reaction. Deep cascades fill the Overcharge meter, and a full meter unleashes Vector Shift or Reactor Pulse to turn a hard board around without spending a move. FORGE SPECIAL DEVICES Match four for a Pulse Capacitor that clears a whole row or column. Build a Nova Reactor, a Singularity Core or an Orbit Drone, then swap two devices together for an even bigger blast. A GALAXY OF CHALLENGES Charge reactors, seal rifts, clear the spreading void, guide drifting debris to safety and blast beacons awake. New mechanics arrive as you travel, from caged devices to conveyor lanes, so the puzzles keep changing. EXPLORE AN ILLUSTRATED ROUTE Scroll a winding map through nebulae, ringed worlds, capital ships and waterfall cities. Earn up to three stars on every route and track your progress region by region. PLAY YOUR WAY • Thousands of levels, with difficulty that rises and eases in rhythm • Boosters and tools to help when you choose to use them • Every level can be completed without paying • Reduced motion setting, sound and music controls • Plays offline Prism Shards can be earned in play or bought as optional in-app purchases. The game shows optional rewarded ads, which you only ever see if you choose to watch one.