Only Up Parkour 2 is a vertical climb inspired by the Only Up phenomenon: 500 metres of stacked platforms and obstacles, with the constant threat that a missed jump drops you a long way back down.
That fall risk is the entire design. There are no checkpoints in the usual sense, so height gained is height you can lose — which makes each jump matter more than its difficulty suggests.
Reach 500 metres by climbing a vertical maze of platforms — with the constant risk that a missed jump drops you back down a long way.
The design deliberately makes falling costly, which is what gives every jump its weight.
Yes — it runs in the browser with nothing to install.