NV Casino

NV Casino

NV Casino brings Doppelblock - the pen-and-paper grid puzzle that sits between Sudoku and Kakuro - to your thumb. Every row and every column hides exactly two black cells; the cells left over hold the numbers 1 up to two less than the grid's width, each used once along that row and once down that column. The teal clue beside each row and above each column is the sum of only the numbers caught strictly between that line's two blacks - never the whole line. Two blacks side by side means a clue of zero.

Playing is two taps: pick a cell, then press the black square, a number, or the cross to clear it. A few cells come already filled in to anchor the grid; the rest is deduction. Every puzzle is generated and then proved to have exactly one valid filling before it reaches you - no guessing, no ambiguity, no dead ends.

Nothing here can be lost. Undo steps back a move, Reset clears your own entries, Check underlines anything that already breaks a rule, and a Hint fills one correct cell when a grid has you stuck. A wrong turn costs only a slip on your counter and the clock still running.

Twenty grids climb from a gentle four-by-four to a full seven-by-seven, and within every block of five the board hands you fewer cells to start from. Solve cleanly and under par time for three stars. Coins are earned by solving, the shop holds nothing but hint packs, and every answer on the board is one you reasoned out yourself.