A puzzle app that respects an evening.

The idea

Most puzzle apps pull in one of two directions. Either they are a single game with no reason to return once you have solved it, or they are a slot machine with a puzzle painted on the front — endless sessions, endless prompts, endless ads.

Logikoo aims at the space between. The puzzles are honest classics with no gimmicks, and the progression around them is deliberately finite: a handful of runs before the energy is spent, a short list of tasks each day, a season that ends and starts again. You close the app because the session is over, not because you finally managed to.

Why these seven

Each of the seven asks for a different kind of thinking, and that variety is the point — a bad night at Sudoku is a good night at Simon.

• Memory Match — recall, under a move counter.
• Sudoku — constraint logic on a 6×6 grid, sized for a phone.
• Lights Out — parity puzzles that look like luck until they suddenly don't.
• Mastermind — deduction from partial feedback.
• Tower of Hanoi — recursion you can feel in your hands.
• Simon — working memory, and nerve.
• Sliding Puzzle — spatial planning several moves ahead.

All seven ship in Easy, Medium and Hard. The difficulty is not a cosmetic label: it changes the board size, the number of colours or the count of starting clues, and it is recorded alongside your result so leaderboards only ever compare like with like.

How the loop works

Everything below is earned by playing. There is no way to pay real money for coins, energy, chests or a better rank.

Energy

Starting a game costs energy, which refills on its own over time. It is the app's way of saying that a session has a natural end.

Tasks and levels

Daily tasks ask for something specific and pay coins when you finish them. Every completed game also feeds an XP bar, and levels release milestone rewards along the way.

Chests, loot and the shop

Tasks and milestones hand out chests. A chest opens into items with a rarity, and rarer drops get the loud treatment. Coins you earn are spent in the shop on avatars, frames and banners — decoration, never an advantage.

Leaderboards

Records are kept per game and per difficulty: fewer moves, fewer mistakes and less time make for a better one. Boards run on a season and are settled when it ends, and your own row is highlighted so you can find yourself without scrolling.

Fair play

A leaderboard is only worth something if the results on it are real. Scores are submitted to and validated by our server, and results that are impossible for the difficulty they claim can be rejected or removed. Accounts used to cheat, automate play or manipulate rankings can lose their entries or be closed — the details are in the Terms & Conditions.

The craft

Logikoo is built in Flutter from a single design system: one violet accent, Figtree in its heavy weights, and a flat 4px radius on every card, button and input. Glow is scarce on purpose — it is spent only on things that should feel valuable: energy, rarity, chests, and your own row on a leaderboard.

The same restraint applies to what the app does behind your back, which is nothing. No advertising SDK, no analytics SDK, no third-party tracking. The only server Logikoo talks to is ours, and only to keep your account, your progress and the leaderboards. That is written out in full in the Privacy Policy.

Who makes it

Logikoo is made by DevHaven Apps, a small independent studio. If you have found a bug, want a game added, or need something done with your account, write to support@devhavenapps.com — a person reads it.