Spewartless (Luncheon Kingdom)

From SMO.wiki

In the Luncheon Kingdom, Spewartless is an advanced trick used to skip the Spewart boss fight without triggering it. In many speedruns, this results in a complete reroute of the kingdom, since subsequent story moons will not spawn without collecting the one from Spewart beforehand and other moons must be collected instead. However, it often still saves time due to how long it takes to defeat Spewart and collect the moon.