1. Auto block locking function: Once all blocks with the same color ID in the image are fully drawn, they will be automatically locked. No other colors can be drawn on locked blocks to prevent accidental brush touches.

2. Large-area coloring optimization: Fast drawing no longer produces broken lines. A high-speed drawing fill-completion feature is added. The success rate of triggering automatic large-area filling at canvas edges has been raised to 100%.

1. Improved the large-area coloring feature: Added canvas edge detection. When painting a large area with the same color at the edge of the canvas, you no longer need to draw the full outer outline of the region to trigger auto-fill. Simply connect the outline of the color block to the canvas edge to seal the area, and it will fill automatically. This reduces drawing workload by 30% compared with previous versions.

2. Thumbnails for uncleared levels are changed from semi-transparent to grayscale.