Exvania/Castle 3: Castle of Spring

From this castle, slimes will start appear, and dragons can breath lethal fire.

Room 3-1
This room contains 36 Treasure Boxes (containing 8 Bomb Power Ups, 10 pairs of Jet Boots and 16 Magic Books); two of them being empty. An infinite amount of Green Slimes (1 hit point) will spawn.

Room 3-2
This room contains 28 Treasure Boxes containing 7 Bomb Power Ups, 12 pairs of Jet Boots and 8 Magic Books; one of them does not contain anything, and a Rally-X Special Flag may appear.

Room 3-3 (Dragon Room)
This room contains a Red Dragon (30 hit points, can breath fire), along with 48 Treasure Boxes, containing 8 Bomb Power Ups, 16 pairs of Jet Boots, 10 Magic Books, 2 Earthquakes, 4 Morning Stars, and 4 Boomerangs. Four of them do not contain anything - and an infinite amount of Purple Slimes (4 hit points) will also spawn.

Room 3-4
This room contains 50 Treasure Boxes containing 16 Bomb Power Ups, 13 pairs of Jet Boots, 19 Magic Books, and 1 Earthquake; one of them does not contain anything, and another Rally-X Special Flag may appear.

Room 3-5
This room contains 45 Treasure Boxes containing 5 Bomb Power Ups, 20 pairs of Jet Boots, 14 Magic Books, 3 Earthquakes and 1 Potion of Death; two of them do not contain anything. Green Slimes will also spawn.

Room 3-6 (Dragon Room)
This room contains another Red Dragon (30 hit points, can breath fire), along with 48 Treasure Boxes, containing 8 Bomb Power Ups, 16 pairs of Jet Boots, 10 Magic Books, 2 Earthquakes, 4 Morning Stars, 4 Boomerangs and 4 empty chests. Purple Slimes will also spawn. A third Rally-X Special Flag may appear.