LineIQ — Brain Test

Think you can pass the brain test? Draw every line in one continuous stroke without lifting your finger and without tracing the same line twice.

LineIQ is a relaxing yet challenging brain puzzle game based on logic, patterns, and the classic Euler path. Each level gives you a shape made of dots and lines. Your mission is simple: find the right path and complete the entire shape in one shot.

ONE LINE. ONE SHOT.

Touch any dot and start drawing. Connect every line exactly once, without lifting your finger. Made a mistake? Drag backward to undo your last moves and try again.

There is no timer, no lives, and no pressure. Just you, the puzzle, and your brain.

A BRAIN TEST THAT MAKES YOU THINK

LineIQ is more than a simple connection game. Each puzzle is built around real mathematical principles.

Look at how many lines connect to each dot. Dots with an odd number of connections can reveal where a solution should begin or end. Once you start recognizing the patterns, puzzles that seemed impossible become much easier to understand.

Train your logic, concentration, spatial thinking, and problem-solving skills while solving hundreds of unique puzzles.

FEATURES

• 300+ handcrafted brain test levels
• 10 puzzle packs with increasing difficulty
• Endless Mode with procedurally generated puzzles
• One-way lines that change the rules
• Double-trace lines for extra challenges
• Three-star rating for every level
• Optional hints when you get stuck
• Offline gameplay — play anywhere
• No timer, lives, or energy system
• Simple controls — just touch and draw
• Calm visual design with a deep navy theme

RELAXING PUZZLES WITH MUSIC

Every connection creates the next note of a soft pentatonic melody. Build a long, clean path and your solution creates a rising musical sequence.

It turns a traditional logic puzzle into a relaxing experience you can hear as you play.

FROM EASY TO SERIOUS BRAIN CHALLENGE

The early levels introduce simple shapes and teach you how the one-line mechanic works.

As you progress, puzzles become larger and more complex. You will encounter more dots, more connections, crossing lines, one-way paths, and structures designed to challenge your assumptions.

By the later levels, you will need to plan several moves ahead instead of simply following the obvious path.

PERFECT FOR PUZZLE LOVERS

LineIQ is a great choice if you enjoy:

• Brain test and brain training games
• Logic puzzles and problem-solving games
• One-line and connect-the-dots puzzles
• Sudoku and Nonogram
• Casual games that make you think
• Short relaxing games for your free time

Play during a commute, while waiting for a coffee, before bed, or whenever you want a quick mental challenge.

NO PRESSURE. JUST LOGIC.

No account. No sign-up. No complicated setup. No pay-to-win mechanics.

Every puzzle can be solved through logic and practice.

Play offline and challenge your brain anywhere.

One line. One shot. Can you solve every brain test?