Drag pieces onto the board. Tap a piece to select it, tap it again to rotate. Keys: A / D rotate left / right, W flip vertical, S flip horizontal, Space returns it to the tray.
Find your solution
Interesting finds
The year at a glance
Solutions for every month/day pair. Hatched cells are dates that don't exist, though the puzzle can still be set to them. Select a cell to open that date.
Where the date sits on the board
Average solutions when a given cell is left uncovered, across all real dates that use it. Corner cells are usually the easiest to leave open.
Month by month
Average solutions per date in each month (real dates only).
Day of the month
Average solutions for each day number, over the months that have that day.
Easiest and hardest dates
Most solutions
Fewest solutions
How solution counts are spread
Where each piece likes to sit
Share of all solutions (real dates) in which the piece covers each cell, and how often each rotation or flip of it is used.
Every pair of holes
Dates that don't exist
Feb 30, Apr 31 and friends aren't on any calendar, but the board lets you set them. They're excluded from every other statistic here.