Hue Shift will have you stressed out in no time.
It's a platformer of sorts, where your aim is to climb a tower as high as possible. You control a block that moves automatically across each platform, turning back when it reaches the sides of the tower. You hit space to jump and try to land on the higher platforms.
The trick is you can only land on a platform that is the same colour as your block. So you have to switch colours - from blue to red to green - as you make each jump. If you try to land on a platform of a different colour, you fall back down until you either change to the correct colour or reach the bottom of the screen.
I found it extremely difficult, mostly due to the automatic movement delivering a pace that is unrelenting. And when you make an error and fall, you've got so little time to react and recover. It's a chain reaction of failure.
How high can you climb?
Hue Shift [Kongregate]