River Logic

About the Game

River Logic is an original river crossing puzzle game. Each level gives you a riverbank full of farmers, animals and cargo, a small boat and a few rules — the fox can't be left with the chicken, the canoe only carries 80 kg, only the captain may row. Load the boat, cross, and plan every trip so that nobody is ever left with someone they shouldn't be. The 50 levels are grouped into six worlds — First Crossings, Capacity, Relationships, Special Rules, Advanced and Expert — that add seat and weight limits, rowers, guards and thieves, night crossings with a lantern, a torch-lit bridge against the clock, one-way ziplines, strong currents, islands, three banks and two boats, ending in three boss puzzles. Every level is checked by a solver, so each one is solvable and its best number of crossings is known.

How to Play

Tap the characters you want to send across: they climb into the boat (tap them again to climb out). Then press Cross. The boat needs someone who can row — rowers carry a small oar badge — and it has a limited number of seats, and sometimes a weight limit shown on each character. When the boat arrives, its passengers step ashore and the game checks every bank: if anyone has been left with someone they shouldn't be — the fox with the chicken, thieves outnumbering guards — the level shows what went wrong, and you can undo that crossing or reset. Get everyone to where they belong to finish the level. Later worlds add rules of their own, all listed on each level's rule card: a lantern that must ride along at night, a limited number of crossings, a bridge where the slowest walker sets the pace against a time limit, a one-way zipline, a current that takes two rowers to fight, a safe pen on an island, and levels with islands, three banks or two boats. Finish a level in its best number of crossings without hints for three stars. Your progress, stars and best results are saved in this browser.

Controls

• Tap or click a characterPut them in the boat (tap again to take them out)
• Cross button / Space / EnterCross the river
• UUndo · R — Reset · H — Hint
• Tap a boatChoose which boat to load (levels with two boats)

Gameplay Tips

• •Bringing someone back is often the key move — the classic fox, chicken and grain puzzle can't be solved without it.
• •Before each crossing, look at the bank you're leaving, not just the one you're going to.
• •A bank with only predators, or only thieves, is perfectly safe: trouble needs both sides of a rule.
• •On timed bridge levels, send the two slowest walkers together and let the fastest carry the torch back.
• •Hints come in three steps: a strategy clue, the next move from where you are, then the full solution. Only the first two keep two stars within reach.

FAQ