Pencil Sharpener — free browser game

A pencil and a sharpener sit in front of you; you have 60 seconds to sharpen as many as you can. While you hold the key (Space or pointer), the sharpener's handle turns, shavings curl off the tip, and the 'sharpen bar' at the bottom fills. A green ideal band sits along the bar — release inside it to score +1 and queue the next pencil. Release before it and the pencil ends up dull: no points, but that pencil is gone. Push past the band into the red and you've overdone it: the tip snaps, you lose a point, and a fresh pencil rolls in. Each round the green band narrows and the bar fills faster, so timing it by counting won't last; you have to learn to see the bar's acceleration and let go on sight. One key, mobile-friendly: experiment with short and long holds, find the feel.