Sequence Lock · 4 MIN READ
Sequence Lock: compare the questions before choosing a guess
Enumerate five possible three-digit secrets, then see exactly how one proposed guess separates them into four feedback groups.
A better move starts
with a useful idea.
Concrete explanations for the puzzles you can play here. Read a little, try the idea, and notice what changes.
Target Forge · 4 MIN READ
Target Forge: a negative intermediate can preserve a positive plan
Build the same target through positive and negative branches, keeping operand order and the identity of every consumed token visible.
Binary Weave · 4 MIN READ
Binary Weave: turn a duplicate row into a precise deduction
List the two legal completions of 001…, then use an existing row to eliminate one while keeping column constraints in view.
Knight Trail · 4 MIN READ
Knight Trail: prove one landing is a dead end
A fully specified partial five-by-five trail shows two legal next moves, but only one leaves an unvisited onward landing.
Water Jars · 4 MIN READ
Water Jars: verify a route and understand what makes it shortest
Trace a five-and-eight teaching configuration to six units, then distinguish checking one successful route from ruling out all shorter ones.
Line Weave · 4 MIN READ
Line Weave: filter complete placements before making the next mark
Combine an eight-square 2,2 clue with one filled square and one known empty square to find two surviving placements and four new forced marks.