alterations. The sunlight is no longer used just for energy, but also as a form of currency called SOLL, which is good all over San Miguel. As the player plays the game in daylight, the player builds Solar Energy, or SOL, in the solar stations scattered throughout the in-game world. By converting SOL to SOLL via the local bank (where SOLL is stored and can gain interest) with a 1 SOL=1 SOLL conversion rate, energy can be turned into cash. This cash can be used to buy weapons or other various items. SOLL is also used to purchase a life when the player dies and wishes to continue. The player can get SOLL by selling unneeded items. SOLL can also be converted back to SOL when needed, so one can get energy, make it cash, buy things, and convert leftover SOLL to SOL. Unlike in the first game, the player does not start over from the beginning of the game after finishing it. The player resumes the file in the last area. Like the first game, this one has a minigame that can be unlocked by completing the game twice. The player can gain access to this minigame by talking to Nero the cat (Kuro in the original Japanese version) or completing the game an even number of times. Prizes for high scores include photos and healing items. Boktai featured a level named the "Azure Sky Tower" which presented a formidable challenge to players who have completed the game or were highly skilled. Boktai 2's equivalent is named Dream Avenue. Progress through the level yields Tarot cards, Bearnuts, Sunny Clogs and more. Completing the Avenue nets the player a prize, with quality of the prize based upon the difficulty of the challenge. There is also a Battle Arena to test the player's skills in a boss rush-type mode. There are four difficulty levels to the arena: Bronze, Silver, Gold, and Platinum. The player gets a special item for completing each difficulty level, usually an accessible photograph of one of the game's main characters. The player has access to various missions from different characters after Lady returns to the library. There are four levels and three missions for each area. The player will be awarded for completing each mission. The player will get a tarot card or armor upon completing the first This game also features both new and old enemies.