Play Thermometers Online - Mercury Fill Puzzle

Play Thermometers puzzles online for free! Fill thermometers to the right level using row and column clues. Each thermometer fills from its bulb. 500 free puzzles.

Logic Puzzles CA — Modern Browser Puzzles and Brain Games

Play beautifully crafted logic puzzles in your browser. Explore Crowns, Binary Sudoku+, Aquarium, Color Flood and more — fast, mobile-friendly, and free.

Our Games

Crowns — A symmetry-based grid puzzle using pure deductive reasoning
Binary Sudoku+ — Fill grids with 0s and 1s following unique row and column constraints
Aquarium — A water-filling logic puzzle based on constraint satisfaction
Color Flood — Connect colors across the grid using logical deduction
Dot Stream — Path-finding puzzles based on graph theory
Daily Logic Puzzles — A fresh set of brain teasers every day
Solitaire Pro Collection — Classic card games with six variants
Enclose Fox — Build pens with limited walls in this daily grid puzzle

Learn More

Blog — Articles on puzzle design, solving strategies, and brain science
About Us — Meet the team behind Logic Puzzles CA
Mobile Apps — Download our puzzles for iOS and Android
Contact — Get in touch with us

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