Observed arrival · 2026-10-13
Qidolab’s 18 hands-on logic games
An interactive collection of logic and math puzzles that lets players try moves, get hints, and read explanations.
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$Paid
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People learning logic and mathematical reasoning
- Worth noticing
- The coin puzzle explains a 3–3–2 split, then narrows the final weighing to at most three candidates.
Field notes
The water-jug puzzle tracks the quantities after each move and allows filling, emptying, and pouring until a jug is full or the other is empty; players cannot estimate by eye. Its explanation reframes leftover capacity as a measuring aid, then contrasts the solvable 7 L and 4 L case with an 8 L and 4 L case that cannot produce 5 L under the stated operations. Other visible challenges include toggling six linked lights and testing a claim with integer inputs.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue