Echo vs Logic Arcade

Can you remember a pattern — after it rotates, flips, and shifts color? Echo challenges your visual memory like no other puzzle game. Memorize. Transform. Reproduce. How far can you go? HOW IT WORKS • Study the color pattern on the grid • The grid transforms — rotated, flipped, color-swapped • Reproduce the transformed pattern from memory • Each level gets faster, more complex, more satisfying NOT ANOTHER MATCHING GAME Echo isn't about flipping cards or remembering pairs. It's about spatial reasoning and visual transformation — a puzzle that genuinely challenges how your brain processes change. FEATURES • Grid sizes from 2×2 to 6×6 • Rotations, reflections, color shifts & compound transforms • Classic, Zen, Blitz & Daily Challenge modes • Compete on daily & weekly leaderboards via Game Center • 10 visual themes: Neon, Pastel, Mono & Retro and more • Procedural sound design with pentatonic scale • Haptic feedback on every interaction • 17 languages supported FREE TO PLAY • Your first game each day is completely ad-free • Short interstitial ad before each game (never during gameplay) • Upgrade to Pro to remove all ads forever PRO UPGRADE • One-time purchase — no subscriptions • All themes, all modes, all grid sizes • Daily & weekly ranking competitions • Zero ads, ever Simple to start. Genuinely hard to master. Built for players who want a puzzle that respects their intelligence.

Eight classic math and logic puzzles in one app. No ads. No accounts. Just puzzles. GAMES INCLUDED: - Water Jugs — Measure a target volume by filling, emptying, and pouring between jugs. Based on Bezout's identity and the Extended Euclidean Algorithm. - Tower of Hanoi — Move stacked disks between rods without placing a larger disk on a smaller one. Includes the classic 3-rod puzzle and the 4-peg Frame-Stewart variant with a custom sandbox mode. - Sliding Puzzle — Arrange numbered tiles in order on grids from 3x3 to 6x6. The original 15-puzzle, popularized in the 1880s. - Lights Out — Toggle lights on a grid where each press flips neighboring lights. Rooted in linear algebra over GF(2). - Knight's Tour — Guide a chess knight to visit every square exactly once. Studied by Euler, solved by Warnsdorff's heuristic. - Egyptian Fractions — Decompose fractions into sums of distinct unit fractions. Features authentic hieroglyphic numeral display. - Turntables — Rotate interlocking rings to arrange colored tokens. A physical model of permutation groups and Hungarian Rings. - River Crossing — Ferry the wolf, the goat and the cabbage (and later wolves, sheep, oxen and a sheepdog) across the river without anyone getting eaten. Alcuin's 1,200-year-old puzzle and the missionaries-and-cannibals problem. FEATURES: - Up to 40+ hand-crafted campaign levels per game - Chapter-based progression with increasing difficulty - Auto-save and resume — pick up right where you left off - "The Math" — brief explainers on the theorem behind each game - Personal best tracking for moves and time - Free Play / Random mode for 5 games + custom sandbox for Tower of Hanoi and Knight's Tour (Pro) - Works completely offline - No ads. No tracking. No data collected. UNLOCK FULL GAME: Chapter 1 of every game is completely free. Unlock the full game with a single one-time purchase to get chapters 2-4 across all 8 games, Free Play mode (with chapter 1 Random unlockable for free by beating the chapter), custom sandbox modes for Tower of Hanoi and Knight's Tour, and all future content.