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20190201 Riddler Express

Yes, it is possible to reach the smiley face in 42 or 45 moves.

The following tables show the entry cell, and all the cells that were entered:

Solution in 42 moves
Solution in 45 moves

One way to solve this is via brute force — enter via one of the 32 entry points and test each possible combination of routes. I implemented this in Excel where each row corresponds to a move.

The first row specifies the starting row, column, and absolute direction in degrees (i.e., 0 degrees, 90 degrees, 180 degrees, 270 degrees).

The following row “moves” by updating the row and column using trigonometric identities. It updates the previous absolute direction based on the relative direction in the cell. This process is repeated until it hits the :), hits the Xs, hits the ?s, leaves the grid, or becomes recursive. If it hits the ?s, user input is tested for all possible options.

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