The objective is to complete the knitted pattern at the top of the screen by using colored threads. To do this, you must first clear the board of all colored pins. Select a spool of thread and navigate it through the maze to collect all pins of the corresponding color. Once all pins of one color are collected, the thread is automatically used on the pattern, and the spool disappears from the board, potentially opening new paths. Repeat this process for every color until the board is clear and the pattern is complete.
The video shows the solution for Level 238, which is designated as a "HARD LEVEL." Some pins on the board have numbers (e.g., "3" or "4"), indicating you must pass the spool over them that many times to collect them. A chain blocks a path, which can be unlocked by moving a spool over the corresponding colored key.
The key to solving this puzzle is planning the sequence of your moves. Since clearing a color removes its spool, you must clear the colors in an order that doesn't trap other spools. A crucial trick is to use the empty holding spots at the top to temporarily park a spool, clearing a path for another spool to pass through a narrow corridor. Systematically clearing sections of the board and prioritizing the removal of spools that block multiple paths is the most effective strategy.