at the start of wall jump room walk off the pipe not holding B. when in the air after walking off the pipe start holding B. do a forwards walljump. that setup gives you 2 frames to do the walljump instead of 1.
I'm new but what has worked for me is, Jumping off the pipe to WJ pixel. I was unable to ever hit it the normal way.
Something else I just started fooling around with is, Not holding R when I jump, Then resuming holding R during the jump.
Don't know if it's just me but it seems to hit the pixel more often.
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