Open ULTRAKILL
Simple enough.

Select the PLAY button in the main menu

Select a Difficulty, from personal experience, Standard is best for the GRASS EXPERIENCE™ on ULTRAKILL™

Select ACT I - INFINITE HYPERDEATH of ULTRAKILL

IF YOURE SENSITVE TO JUMPSCARES PLEASE STOP AT THIS POINT...


Select one of these 2 levels, 1-1 is the best as there are no enemies to interrupt your GRASS EXPERIENCE

Walk into the level, in our example 1-1
See all that grass ? ON STEP 7, you'll touch it.

Go near the grass, you can now step over it, or hit it with your fist for you to TOUCH GRASS

CAREFUL, THERE IS A RISK ON TOUCHING GRASS.
Properly walk up to the grass, and step on it lightly, or punch it firmly, proper safety will look like this.
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I'll now show you an example of the WRONG way to handle grass
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This safety hazard resulted in the DEATH of the grass toucher, be careful
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On worst case scenario, you might catch everything on fire, if this happens I recommend restarting the level and avoiding grass, as you are not suitable for the GRASS EXPERIENCE

Be sure to not abuse on grass, thought it may be a new experience to over 99% of the ultrakill playerbase, it is trully one of the experiences of mankind.
Thank you.
Grassman out.