Game Modes
Undermine has three main Game Modes: Undermine, Othermine, and WHIP. Each game mode offers different styles of play.
Undermine
This is the main gamemode and is also known as the story mode. It is the only mode available at the beginning of a new save. This mode consists of 5 main zones with an alternate finish through a 6th zone. The first 4 zones each have a boss that can be optionally fought, however the final zone boss must be killed to finish the run by spawning the portal to the Endroom. Each zone has its own enemies themed to the zone which they are in. The difficulty of this game mode can be increase by attaining Summoning Stones which can only be gotten by defeating all 5 main bosses in a single run.
Killing all the bosses in Undermine atleast once will unlock the final boss fight by gathering the fragments to open the main gate in the Terminal (The north room of the hub).
Othermine
This is the game's roguelike mode. It is unlocked by defeating Seer, World's Heart for the first time. It can then be accessed at the cost of 1 
nether in the north room of the Hub by speaking to The Gatekeeper. Being the roguelike mode it randomizes multiple aspects of the game in comparison to the Undermine. All enemies, and inital meta progression upgrades are randomized along with the zone theme order. The Othermine has 12 floors in comparison to Undermine's 20, however in this mode every boss must be killed in order to progress.
When the player reaches the bottom of the Othermine they will recieve a crown, which crown they recieve is based on the number of runs they have complete sequentially.
WHIP
This is a daily challenge mode which is adds additional variation to runs that can be played in either Undermine or Othermine. It is unlocked by speaking to Camilla after defeating the final boss, and it will start the player with a random preset of items that changes on a daily basis. The main goal of the mode is to get the highest score on the leaderboard.