Easy Binairo boards are guaranteed solvable with just the three starter techniques. Pairs (doubles): two identical digits side by side must be capped at both ends by the opposite digit — 1 1 becomes 0 1 1 0, because a third 1 would break the no-three rule. Sandwich: two identical digits with one gap between them force the opposite digit into the middle — 1 _ 1 must become 1 0 1. Counting: each line needs equally many 0s and 1s, so the moment a row or column reaches its quota of one digit, every remaining cell takes the other.
Every move on an easy board follows from something visible right now — no lookahead, no what-ifs. That makes this tier the right place to build the scanning habit: sweep for pairs, then sandwiches, then re-count each line.
Start with a 6 × 6 board, then work up. When easy boards start feeling automatic, the medium tier introduces completion analysis.