In Sudoku you have 9 different symbols, which must not be repeated; in FlowDoku, you have a smaller number of symbols, some of which must be repeated a given number of times.
The second rule is the stroke of genius: the symbols that appear multiple times in a box, must be next to each other.
At the beginning of each puzzle you have a number of givens; it goes without saying that there is only one way to fill the grid following the rules. So e.g. you need to get from this:
I was particularly impressed by how carefully the user interface has been designed. The basic way to put a symbol in an empty cell is to tap it multiple times, which makes it cycles through the available shapes. This could get tiring quickly, especially with the circle which requires 3 taps, but there is a very clever alternative way: just drag from a symbol which is already on the grid and you'll duplicate it. Cells that already contain a symbol aren't affected, so you can e.g. drag a circle to the opposite side of the grid, if the cells you slide over are empty. This works very well once you get used to it, and reduces tapping to a minimum.
There's a total of over 700 puzzles in the game; 250 can be played for free, the others can be unlocked using several different kinds of in-app purchases, including a single one which unlocks everything.
The puzzles are split across 4 sizes, and for each size they are split in packs of varying difficulty.
12x12 is a bit too crowded for the small iPhone screen, but the controls are precise enough and, if you need to, you can zoom in on every box by holding your finger on it.
Worth mentioning is a novel "roll back" function which doesn't simply undo your last move, but all the moves until your first mistake. This is a brilliant idea for this kind of logic puzzle.
Included is also a strategy guide, explaining some of the logic deductions that can be used to solve the puzzles. I encourage you to find them by yourself, however; it's a lot more fun that way. The rules are so original that they require some deductions very different from anything you might be used to.
This is clearly one of the best logic puzzles released this year. Don't miss it.
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