Ferry. Mind the far bank.
Choose who goes in the boat and cross. Somebody aboard must be able to row, and nobody may be left with somebody they quarrel with.
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How to play and save
Choose the travellers who will cross, then press Cross. The boat holds only so many, and at least one of them has to be able to row — those travellers are drawn with a heavier border. The board is finished when everyone is on the far bank and the boat is there with them.
A crossing that would leave a quarrelling pair on either bank with nobody watching is refused, and the board says so before you spend the crossing. A traveller who can row is also a traveller who is watching, so a bank with one of them on it is always safe.
Tab reaches every traveller and the Cross button; Enter or Space chooses somebody or sends the boat. Undo takes back a crossing. Reset starts this board again; Next puzzle begins a new attempt on the next board.
Each board shows its par, the fewest crossings that can finish it. A finished board earns 100 points at par, less 4 for each extra crossing, down to 20. Undo takes back the boat, never a crossing already counted, so the count you see is the count that is scored.
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