The design of my robot is simple. I built many complex designs but
they could not climb a steeper slope.

I kept most of the weight at the front of my robot because I found
that this made it climb steeper slopes for two reasons: it was less
likely to flip backwards, and it does not slide down the slope as
much. And a new set of tires also helped. My robot has six wheels
to stop my robot from flipping backwards. My robot is gear down two
times: 8:24 then 10:20. In addition, it has a ratchet so it does not
slide down the slope as much.

Vertical incline: 90cm

Horizontal incline: 65cm