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Each level isolates a different deduction about splitting and balance.
1A Clean SplitMove half of 4 to balance every line.tutorial2Any DistanceNumbers in between do not block a move.tutorial3The Larger HalfOdd numbers leave the larger half behind.tutorial4Excess & DeficitMatch one row's excess to another row's deficit.easy5Two LinesBalance columns, then rows.easy6Right DestinationSeveral squares are legal, but only one repairs the totals.easy7Order MattersThe first move prepares a future source.easy8The RelayBuild the number that can make the second transfer.medium9Cross CurrentAlternate orientations to repair both sets of totals.medium10Work BackwardReason backward from the final missing amount.medium11Four by FourA larger board with three independent-looking imbalances.medium12Long FuseTwo values are built for later moves.medium13Two RelaysTwo long relays must be built and drained before the final odd split can close the board.hard14Three Small TransfersThree odd splits build the relays; only after they land can the even repairs finish the board.hard