Techno Hill Zone

Techno Hill Zone is the second Zone in SRB2, designed to make use of the things taught in the previous Zone. It has been redesigned recently for 2.1 and introduces a few new things, the most focal one being buoyant slime.

Overview
Techno Hill seems to take place in a part of Greenflower that Eggman modified into a factory. The checkered walls have pipes in them, the grass is withered and technology is everywhere here in contrast to the previous Zone. Act 2 takes place in the main factory area that you enter at the end of Act 1 and is completely technologified. Act 3 takes place in a train going to places unknown (presumably Deep Sea).

Acts
This level introduces gas jets, buoyant slime, the Spring Shell and the Buzz. It is designed to make use of the things you learned in Greenflower Zone. Advanced knowledge of the various new gimmicks of this Zone allows you to reach rewarding secrets. This also makes use of spindashing through the secret path to the end. It has more than one Emerald Token.

A (normally) very long level - much longer than the previous one. This makes use of slime waterslides and requires you to have advanced knowledge of how to use all the basic moves and the slime (as progressing through the level requires its usage). This features nothing from the previous Zone texture-wise and introduces conveyors and electric floors. It also features a skybox. This features only one Emerald Token.

The second Boss level. It is a bit harder than the previous one but still very easy. This battle features Eggman rotating around a train carriage, shooting damaging slime all over the floor. He can also use a pogo stick to chase you. The level finishes via Egg Capsule.

Main things
This level is COVERED in slime. Gas jets also appear here to propel you up and no Badniks from the previous level were used. This introduces length to SRB2. Waterslides and moving obstacles that impede your progress also first appear here.

Statistics
Enemies:

Green Spring Shell, Yellow Spring Shell, Gold Buzz, Red Buzz, Turret, Deton

Hazards:

Drowning, Electric Shocks

Things introduced:

Electric floor, Skyboxes, slime, gas jets, buttons, rising/falling objects, projectile enemies (Deton), endlessly "moving" objects, new textures

Emerald Tokens: Three (two in Act 1, one in Act 2)

Acts: Three

Status: Complete

Trivia

 * Act 1 features both Buzzes, while Act 2 only features Gold ones.
 * This level introduces skyboxes, non-solid 3D backgrounds (most visible at the end).
 * Yellow Spring Shells drop their springs upon death. Green ones do not.
 * This is the only level that seems to take place in a previous one.