How Guess My Number teaches kids to halve the search with Higher / Lower
A parent guide to Tomorrow Kid’s Logic Lab Guess My Number—guess → Higher/Lower → grey-out, middle-halving coaching, optimal-guesses stars, and 7+ placement.
What Guess My Number is for
Tomorrow Kid’s Guess My Number world is Logic Lab’s Higher / Lower puzzle (higher_lower). The robot thinks of a secret number from 1…max. Kids tap a guess; wrong answers show Higher ⬆️ or Lower ⬇️, grey out ruled-out tiles, and shrink the range until they land on the secret—in as few guesses as they can.
Parent tip: say “guess the middle” once before they play. Each answer should rule out half the remaining numbers—an algorithm kids see on the fading grid, without typing any code.
Where it lives
- Confirm the child’s age band reaches 7+ so Logic Lab worlds are available on Home
- Open Logic Lab and tap the Guess My Number world (“Higher or lower? Guess the middle to rule out half”)
- Tap a number on the grid; watch Higher / Lower pills and greyed tiles after a miss
- Keep guessing until the secret is found—stars compare your guesses to the optimal count
For the broader Logic Lab overview (age gate, world ladders, Today’s puzzle), see the Logic Lab ages 7+ guide. This article owns the Guess My Number / Higher–Lower deep-dive only.
Guess → Higher / Lower → grey-out
Play runs in HigherLowerGameView:
| Step | What kids do |
| --- | --- |
| Pick a guess | Tap a number still lit on the 1…max grid |
| Read the hint | Wrong guesses show Higher ⬆️ or Lower ⬇️ |
| Watch the range | Ruled-out tiles fade grey so the shrink is visible |
| Stars | Scored vs optimal guesses ⌈log₂(max + 1)⌉ (subtitle shows “N guesses · best K”) |
An intro “watch me” demo guesses the middle once so kids see half the grid disappear. After too many misses, calm coaching nudges them toward the middle again. Stars still feed the familiar Sticker Book economy. Levels scale the max from about 10 up to 50.
Why guessing the middle helps (no typed code)
The fastest strategy is a binary halving: always pick near the middle of what is left. One answer rules out half the candidates. Parents can name that habit without saying “binary search”—kids discover it by watching the grid fade.
That is distinct from:
- Which Is Heaviest? (Balance Scale) — ternary weighings with pans and “I know which!”; see the Balance Scale guide
- Yes or No? — Flow Chart facts → yes/no arrows (decision trees, not number search); see the Flow Chart guide
- Pixel Painter — pictures ↔ numbers encode/decode; see the Pixel Painter guide
- Secret Codes — picture↔letter cipher wheel; see the Secret Codes guide
- Pass & Play Bug Hunt — two-player plan fixing; see the Pass & Play guide
- Today’s puzzle — one shared Home board per day; see the Today’s puzzle guide
A calm way to introduce it at home
- Confirm age band 7+ and open Logic Lab together.
- Clear one simpler world first (Robot Walk or Bug Hunt) so the list feels familiar.
- Open Guess My Number, let the intro middle-guess demo run, and narrate “half gone.”
- Let them tap their own guesses—celebrate the stars even if guesses were not optimal.
- On a later session, ask “could the middle find it sooner?” and stop after one board.
What to try next
Keep Guess My Number as the “halving the search” stretch after simpler Logic worlds. Use Balance Scale when you want fewest-weighings stretch (8+), Pass & Play for a shared Bug Hunt handoff, and Today’s puzzle for the daily Home ritual. Ready to try it? Open Tomorrow Kid → Logic Lab → Guess My Number.