Sweetest Sorrow (バレンタインvsホワイトデー大戦争, Barentain vs Howaitodee Daisensou, Valentine vs White Day Great War) is the Valentine's Day event in The Battle Cats. This event introduced the Timed Score Reward system to the English version The Battle Cats (the Survive! Mola Mola! Collaboration Event introduced Timed Score stages to the Japanese Version).


During this event, a new enemy unit appears: Martin! And if any player clears any of the stages during this event, a new cat unit only available during this event: Marshmallow Cat, can be unlocked by chance. The further you progress through the levels, the higher your chances of unlocking the cat unit increase. The player can get the unit with a 100% chance in any of the stages using Treasure Radar, which can be purchased at any time in the Shop menu.

List of Levels

English Version Japanese Version Translation
Stage 1 Mallow March 潜入作戦!「CHOCO」 Infiltration Strategy! "CHOCO"
Stage 2 Marzi Pain 奪還作戦!「OKAESHI」 Recapture Strategy! "RETURN GIFT"
Stage 3 Cavity Creeping 忘れ去られた愛 Forgotten Love

First Appearance

English Version

  • May 12th, 2015 to June 1st, 2015

Japanese Version

  • March 15th, 2015 to March 30th, 2015



Celebration Events
Sweetest Sorrow Mallow MarchMarzi PainCavity Creeping
All Hallows Road Sweet SamhainLantern O'JackCosplay CarnivalTrick or TreatmentHello Hello HalloweenHarvest Festival
Jolly St. Nick Coming to Town!Reindeer GamesWhipped CreamCoup d'WorkshopWar on Xmas
Summer Diary Short ShortsSquirtgun WarfareCandy Apple DentistryMosquito HellSparkler HeavenBackyard BBQ
A Cultured Festival Meatless WienersDeep Fried AirBurnt to PerfectionNot Quite OrganicOutta Change...Always In the Red
Cats in the Snow Langue de ChatWhite DoveSnow at DawnBuddha of RomanceIcy Desire
Day of the Cat Savage InstinctBloodstained ClawsThe 222 Incident
Spring Sprang Sprung Season of RebirthBunny Bros.Island Egg HuntNative CulturesMost AncientRongorongo
The Midas Touch Gold in a Coal MineI My Me MinerGolden Age's DawnNever Not Shovelin'Dreams Come False
Sliming to Victory Rainy Day RacesTinpot TrophyStormcloud StakesParadise DerbySlimy Stallions
Summer Lesson Kids At SchoolI Am A Catc2 = a2 + b2War of the RosesN2+3H2→2NH3
Silver Week No Shame in 2ndSilver AnniversaryA Distant Road
Go Go Graduates! Pencil LauncherDemon Drill SgtOne-Use CannonSanitary CorpsCat Army's Day Off
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