Colojon is an arts-and-crafts game similar to coloring, cross-stitch and paint-by-number games. It offers pixelated patterns that feature many favorite characters and themes, including animals, food and landscape items, and holiday objects and characters. The player fills in numbered cells on a grid-style pattern with colors.
Colojon's interface is nearly identical to cross-stitch games. The player increases and decreases the size of a pattern using zoom in and zoom out magnifier buttons near the bottom right corner. They restore the pattern to its original size with a button near the top right corner. The paint palette is a horizontal bar below the pattern along the bottom of the screen.
The player colors the artwork by simply selecting a numbered color, and then selecting an empty, matching-number cell. That said, Colojon doesn't allow multi-cell coloring. They can't turn the cursor into a paintbrush that fills all matching cells with fluid movements. They can only fill one cell at a time. The game also doesn't allow mistakes. The player can only paint a cell that features a matching number.
Colojon provides the player with the wonderful option to create a custom picture. They use the Make a Picture and + buttons to access an editor that allows them to paint a cell-by-cell picture with pre-numbered colors. When they return to the main screen, they pick the picture, which the game then displays as an uncolored, numbered, grid-style pattern.