Function Platformer y = f(x)

How it works. Your curve is the road: the kart rolls along it, accelerating downhill (Launch or Enter to go, Space to launch/reset). The level is a grid of fixed-size cells. Path cells (open) are where the function should be traced — the curve is rideable there. Gap cells (amber-striped) are places off the optimal path: the curve is cut inside them, but the kart can fly through — jump them with momentum. Filler blocks wall off all remaining space; they cut the curve and crash the kart on contact, constraining the solution to one or a few function shapes.

• Zoom: the plot window is 0 ≤ x ≤ x max, 0 ≤ y ≤ y max (y = 0 at the bottom). Changing the limits rescales the curve only — the cell grid and the kart keep their pixel size, so shrinking y max makes the same formula steeper (and faster).
• Syntax: + - * / ^, implicit products like 2x or 3sin(x), functions sin cos tan sqrt abs exp ln log10 floor min max …, constants pi e tau. Example: 3 + 2.5sin(1.05(x - 5)).
• Runner levels: on level 1 the rider is a person you control — run with ←/→ (or A/D), jump with Space, ↑, or a click. Nothing moves until you do. Step functions like floor(x) + 1 draw the discrete platforms to climb.
• Physics: launching off a rising lip throws you upward; flying off a crest happens on its own when you're fast enough. Too slow for too long and the kart stalls.