Techniques
Seven deductions, cheapest first. Every Hoot & Fox puzzle can be solved using only these — the app's hints name them so you learn as you play.
Pair → bookends
Two alike together decide both neighbours.
Gap fill
An alike pair with one cell between fixes the middle.
Count exhausted
A line with all its owls placed is all foxes from here.
Count pressure
When the remaining owls can’t fit without a crowd.
Triple look-ahead
Test a cell; if it forces three in a row, it’s the other animal.
Links = and ×
Using the joins to carry a known cell across.
Chain reasoning
Both branches of a two-way cell agree somewhere else.
How do you solve a Binairo puzzle?
Sweep for the free moves first: two alike side by side force both neighbours (bookends), and two alike with one gap force the middle (gap fill). Then count each line against its quota of half owls, half foxes. Only when those run out do you test cells — first within one line, then across the whole board.