CT Lite+ vs Skyscrapers

Puzzle helps to learn Cartesian coordinate system (x,y) and practice to calculate sums over the line (the very first step to understanding integration). Sound: switch Ring/Silent controls speaker. After 30 seconds quick shake to restart the puzzle or reveal the answer with just a tap. In Gradients puzzle each cell has a value that contributes to the sum when calculated along a row or a column. Additionally, the value of each cell depends on the direction of the summation ("anisotropic field"). Sometimes, the clues can be satisfied by different pattern of orange cells. This means that, without additional information, solving the puzzle may involve a guessing step. An interesting phenomenon is the formation of "isomers", where an alternative solutions can be created by inverting a subset of cells. When playing for fun, any of the isomers is considered a valid solution. However in Competition mode, one more clue is added: a sum along the main diagonal. This additional clue helps distinguish between isomers.

Skyscrapers is a logic puzzle about heights. Each grid is a city block seen from above: every row and column holds one tower of each height, and the numbers around the edge say how many towers you would see standing at that spot. Taller towers hide the shorter ones behind them. That is the whole rulebook. The rest is deduction. HINTS THAT TEACH Most puzzle apps answer "what goes here?". Skyscrapers answers "why". Ask for a hint and it walks you through the deduction in three short steps: where to look, what the clue forces, and the move. It points out a wrong tower before you build further on it, and when a step needs notes, it pencils the candidates in for you and strikes out the ones that cannot stand. You learn a technique, not just a number. 4,400 PUZZLES, ONE SOLUTION EACH Six tiers, from a gentle 4×4 to a 9×9 grandmaster board, 100 puzzles to a pack. Every puzzle is checked to have exactly one solution, so pure logic always gets you there. No guessing, ever. A thousand puzzles are free from the start. The rest open with keys you earn by playing, or all at once. A NEW CHALLENGE EVERY DAY One daily puzzle, the same for everyone, with a board of the day's fastest solvers. Keep a streak going for rewards at 7, 14, 30, 60 and 100 days, and go back through the last 30 days in the archive if you missed one. LEAGUES, QUESTS, FRIENDS Every Monday you start a fresh league against players around your level. Harder puzzles are worth more points, and the top finishers move up. Weekly quests set a small goal on the side, and you can follow friends to keep an eye on their times. THREE LIVES, THREE MODES Classic gives you three lives, and a wrong tower costs one. Run out and a short ad refills them, or you take a three-minute break. Time Trial races the clock. Zen sets the lives aside and lets you think. KEYS Keys pay for hints and unlock packs. You earn them from the daily puzzle, streak milestones, achievements, the weekly quest, a top-ten finish and by inviting friends. SKYSCRAPERS COMPLETE One purchase unlocks every pack, removes ads for good and lifts the three-life limit. No subscription. It also brings 108 skyline avatars to make the game yours. Prefer to earn it? Invite friends who start playing, and everything unlocks the same way. MADE TO BE LIVED IN Calm colour palettes for day and night, clean typography, and a board that reads at a glance. Play offline, sign in only if you want your progress and leaderboards to follow you, and choose from 14 languages. Made with care by Fluttech. Questions or ideas? There is a feedback button in Settings, and we read every message.