Build the lake.
Read the neighbours.

Draw a 3 × 3 grid. Label rows A, B and C from top to bottom, and columns 1, 2 and 3 from left to right. Put a neutral camp tile in the centre, B2. It remains there for the whole game.

Each player receives four owned tiles: two channels, one reed and one pool. Mark ownership with a distinct initial or shape. All tiles are visible from the start, and no tile is drawn randomly. Paper squares are sufficient.

Choose one of your remaining tiles and put it in an empty square sharing an edge with the camp or any previously placed tile. Above, below, left and right count; diagonal contact alone does not. The first placement must therefore be at A2, B1, B3 or C2.

Once placed, a tile cannot move, rotate into another type or change owner. Its pictured orientation has no rules effect. A turn consists of exactly one placement. With this connected-board rule and the stated supplies, a legal empty square remains available until the board is full.

A reed at A1 with pools at A2 and B1 scores 2 points for its owner, one for each shared edge. Each pool separately scores its normal 2 points for its own owner. A pool at B2 is impossible because the camp already occupies that square.

A channel at A2 scores 2 because it touches the camp at B2. A channel at A1 scores 0, even if it touches another channel. Only proximity to the camp matters for channel scoring.

After each player has placed all four tiles, count their owned tile scores using the completed board. The higher total wins. Equal totals are a shared result; there is no tie-break placement.

Reeds are evaluated at the end, so a pool placed later can change the value of an earlier reed. Count together and resolve any arithmetic disagreement by checking the visible shared edges.

The solo puzzle gives one player two channels, two reeds and two pools. The camp begins at B2 and the same connection and scoring rules apply. Place all six tiles, leaving two squares empty, and try to reach at least 10 points. There is no opponent or ownership split.

The displayed score updates as tiles are placed. A disconnected placement is rejected without consuming a tile. After six legal placements, the board stops accepting pieces and reports the final result. Reset the lake restores the starting supplies and clears the log; a page reload also starts fresh.