Torque specification

I'm new to this and was following the instructions on csman. Com for my head gasket replacement. I followed the instructions to a T. I tighten my head bolts as per the instructions provided below. Now I understand that the first pass is at 18 lb ft torque. I just don't understand if the 2nd-5th are ft lbs or degrees? Because that's where my confusion starts. This is what happen because I thought it was 18 ft lbs for each pass.

Tighten the bolts (1) in 5 passes. Use the EN-45059 sensor kit :
First pass to 25 N.M (18 lb ft).
Second pass to 90.
Third pass to 90.
Fourth pass to 90.
Final pass to 45.