Exploration bonus is the second bonus awarded when playing daily challenges: The player is awarded a precise set of points for visiting rooms, clearing rooms, and for killing enemies. The damage penalty calculation results in a damage penalty proportional to the players exploration bonus, this means that the player will receive a larger damage penalty the higher their exploration bonus is. The maximum damage penalty is limited to 80% of the exploration bonus.
Each room will have its visited and cleared bonus value assigned according to its type and size, with 2x1 and 2x2 rooms accounting for twice the bonuses for visiting and clearing.
Rooms will default to 10 points for visiting and 40 for clearing if not stated otherwise. Red rooms are worth the same amount as the type of room that they generate as. The table below accounts for the size of Boss Rush, Hush and Black Market rooms, the reader should take care not to double these values again.
Killing enemies will add to your exploration bonus - roughly 10 points for each killed enemy. The following formula applies to most enemies that spawn on room entry:
According to the formula, a single enemy in a room is worth 5 points; 2 enemies are worth 6 points each; 5 enemies 7 points each and so on. Only enemies that spawn on room entry are worth points and count towards the number of enemies in the room, this makes enemies in Challenge Rooms, Boss Rush and those spawned by other enemies worth no points.
The player should explore as much as possible, while still allowing time for Boss Rush and Hush to be completed. It is a good idea to find Secret and Super Secret Rooms, go into special rooms, and fight against Challenge Room enemies and Angels. Looking for Crawl Spaces is not advised in most cases, as bombs can usually be spent better elsewhere. Items that grant mapping or reveal secrets can be extremely useful for getting a high exploration bonus while clearing floors quickly.
Since Ultra Secret Rooms do not grant more of a bonus than regular rooms, it can be better for score to generate Red Rooms where they will grant access to Challenge Rooms, rather than to use them to look for the Ultra Secret Room.
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