How do I flip gravity using a key?

I am looking at setting up a simple gravity switch when the player presses a key, so far I have this ...

But there is no reaction when I press the space bar at all.

Yes, wel. You set gravity to -1500 in the first event when it is different than -1500.

So, the second event is ALWAYS true.

Add system> else to the second condition.

Use a variable for gravity.

Here:

Global Variable: GravVar = 0

Keyboard ON SPACE KEY RELEASED

GravVar = 0 | WAIT 0.1 Seconds.

| Set GravVar to 1

GravVar = 1 | WAIT 0.1 Seconds.

| Set GravVar to 0

GravVar = 0 | Set Player Gravity to 1500

GravVar = 1 | Set Player Gravity to -1500

Thank you ever so much — and 99Instances2Go, solved!