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|
- May 12th, 2015 to June 1st, 2015
- March 15th, 2015 to March 30th, 2015