Here's What's Different On Vucui

Small changes accumulated across the sudoku lineup since the last notes.

• Added a new killer-style grid set alongside the existing classic puzzles.
• Adjusted clue count on a batch of grids that were rated easier than intended.
• Fixed a pencil-mark display bug that occasionally cleared notes after an undo.
• Removed a grid set that stopped loading reliably; replaced it with a comparable one.
• Refreshed the daily puzzle rotation with a new batch of grids.
• Added a new speed-run format tracking personal best completion times.
• Adjusted candidate-highlight colors for better visibility in low-light settings.
• Added a tutorial-style grid series for players new to advanced solving techniques.
• Added a settings option to auto-clear candidate marks once a number is confirmed.
• Rebalanced clue count across mid-tier grids based on player completion data.
• Updated the difficulty-select screen with clearer labeling.
• Adjusted hint cooldown slightly shorter on the hardest expert-rated grids.
• Polished the end-of-grid summary screen with a clearer technique-usage breakdown.

Everything above is already live - no update to install, just refresh and it's there.