The Battle Cats

Version 15.7.1 adds the Treasure Gauge, letting you fill the meter through gameplay and spend a full gauge when entering a Treasure stage to guarantee its highest-tier Treasure. You can also check Treasures directly from stage selection.
Legend progression expands with Zero Legends maps ZL 36 and ZL 37, along with higher-difficulty levels for existing Legend maps. Otherworld Colosseum gains Dirt Cheap 2 and Arena of Honor, while Resort De La Cospa and Restricted Area receive 2-Crown difficulties.
The Battle Cats update adds six Cats, including Rurouni Kenshin collaboration units Anji Yukyuzan, Sojiro Seta, Makoto Shishio, and Legend Rare Seijuro Hiko, plus new collaboration stages and gacha additions. Kenshin Himura and Akechi Mitsuhide can now unlock True Forms, while Voli gains an Ultra Form.
New Talents are available for Immortal Master Tengu, with additional Ultra Talents for Divine Coppermine κ, Immortal Masamune, and Almighty Zeus; Zeus also receives a longer Slow Ultra Talent duration. The Battle Cats latest version also introduces Production Time Reduction, new Cat Combos that boost Freeze and Strengthen, and User Rank rewards from ranks 28,300 to 28,500.