solves.ca
Find a tool, solve a puzzle, or explore a problem.
Puzzles
anagram
Find words and phrases using your letters, with optional must-contain words.
chess
Explore legal moves, check, and mate-in-one from a chess position in FEN notation.
crossword
Find words matching a pattern or fill a small crossword grid.
cryptic
Explore possible wordplay in cryptic clues: anagrams, reversals, containers, and more.
cube
Trace cube moves, inspect the resulting net, and find an algorithm’s inverse.
kakuro
Solve Kakuro sum puzzles and follow the deductions.
minesweeper
Analyze a Minesweeper board to find safe squares and estimate mine probabilities.
nonogram
Solve or create a nonogram using row and column clues.
slitherlink
Find a single loop that satisfies a Slitherlink puzzle’s numbered clues.
sudoku
Solve a Sudoku, ask for a hint, or generate a puzzle with explained steps.
tangram
Check piece area, overlap, and containment, or search for a tangram arrangement.
wordle
Narrow Wordle answers from your guesses and rank the next words to try.
Tools
chem
Calculate molar mass, dilution, stoichiometry, and grams-to-moles conversions.
colour
Convert colours, check contrast, and generate related palettes.
datetime
Compare dates, add durations, count business days, and convert time zones.
dice
Calculate dice-roll probabilities, expected values, and distributions.
electronics
Calculate voltage, current, resistance, impedance, and circuit time constants.
finance
Calculate loan payments, compound interest, doubling time, and break-even sales.
layout
Calculate aspect ratios, type scales, spacing, and fluid CSS sizes.
materials
Calculate board feet, stock sizes, and material quantities.
modulation
Explore AM and FM sidebands, modulation depth, and signal bandwidth.
music
Explore scales, chords, transposition, and Nashville numbers.
network
Calculate IPv4 subnets, address ranges, netmasks, and address membership.
pll
Plan PLL frequencies, divider ratios, VCO ranges, and DSP clocks.
probability
Calculate binomial, hypergeometric, and Poisson probabilities, or convert odds.
radio
Convert frequency and wavelength, size antennas, and calculate power and harmonics.
regex
Test regular expressions, inspect matches, and understand each part of a pattern.
stats
Summarize a dataset, calculate percentiles, or fit a regression line.
units
Convert units of length, mass, volume, temperature, time, and more.
Solvers
cellular
Run cellular automata and explore the patterns and complexity they produce.
constraint
Define variables, allowed values, and rules to search for satisfying assignments.
equation
Solve linear and quadratic equations with algebraic steps.
graph
Find shortest paths, colour graphs, and build minimum spanning trees.
lineup
Arrange players, singers, or speakers with balance and adjacency rules.
logic
Explore Boolean expressions with truth tables, Karnaugh maps, and satisfiability checks.
packing
Fit items into bins or choose a valuable load within a weight limit.
routing
Compare shortest tours through a set of points using exact and approximate methods.
sat
Solve Boolean constraints or DIMACS clauses and inspect satisfying assignments.
schedule
Create round-robin fixtures or a timetable from teams and scheduling rules.
seating
Plan event seating with capacity, grouping, and keep-apart rules.
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