NG2 4-1

Ninja Gaiden II: Act 4, Stage 1
4-1 a short stage with a trippy background and a couple of difficult maneuvers. In any%, the goal is to obtain Invincible Fire Wheel, a Scroll, and reach the end of the stage with at least 15 ninpo.

Room 1 (Furnace)
In the first section, you should collect the Art of the Fire Wheel. Damage boost off of the third Clubber, and you'll come to a pit with a Mortar spawn. The Mortar can be taken out with an Art of the Fire Wheel, but it also can be dispatched with a well-timed jump slash. Collect the Orange Ninpo, and Boost Grab off of the second Mortar to climb the structure in the background. The Invincible Fire Wheel can be collected without stopping using another well-timed jump and damage boost. Use it once and proceed to the end of the room.

Room 2
A small transition room with respawning Flames.

Room 3 (Barbecue Pit)
Use Invincible Fire Wheel after climbing to the top, and proceed all the way to the large pit. The first Item Orb over the pit contains a Scroll, but it can be hard to obtain without stopping - if you miss it, there is a backup Scroll further ahead that can be acquired with little time lost. Use Invincible Fire Wheel right after the first scroll - it should wear off just before you get to the Item Orb with the Windmill Shuriken. Use Invincible Fire Wheel a second time after dropping down to the lower pillars. If you missed the Scroll earlier, the backup is at the next gap between the pillar sets - pass it otherwise. If you timed the last Invincible Fire Wheel correctly, it'll wear off just before the last Mortar erupts, and you can damage boost off of its Mortar to reach the end.