The ground in Delta 1.1 is lava—metaphorically. Large stretches of safe ground have been replaced with spike pits. Many bottomless pits have been widened. Hydrocity Zone, in particular, becomes a nightmare of collapsing floors and air bubbles placed exactly one second too far apart.

: You must apply this patch to a "clean" Sonic 3 & Knuckles ROM.

But after spending a week with 1.1, going back to vanilla feels like driving a Ferrari with the parking brake on. The momentum stacking in is transcendent. You can bounce off an Orbinaut, ricochet into a waterfall, and retain enough inertia to break through a metal bloc without stopping.

In vanilla S3&K, a shield monitor is a blessing. In Delta 1.1 , shields are rare. More common are "S" monitors (Speed Shoes) that often launch you directly into spikes, or "R" monitors that restore your rings but are placed in intentionally hazardous locations. The "G" (Invincibility) monitor now lasts only half its normal duration.