A DDLC note cues an MSM song combo for one BTD6 tower.
A short, solo BTD6 slice on Monkey Meadow. Place one anchor tower and clear round 1. Between waves, Sayori's note reads one poem-word entry from the player's DDLC install and reveals a short–short–hold–short rhythm. Play a local OGG stem from My Singing Monsters and tap Space with its pulse; success buffs the first tower for wave 2.
Free fan mod. Install BTD6, DDLC, and My Singing Monsters. BTD6 also needs MelonLoader and .NET 6 installed; Melty has no automatic loader setup for this noncatalog BTD6 entry. The package includes the separate BTD Mod Helper dependency under GPL-3.0. The original Melody Lane source is MIT licensed and remixable. No game assets, poems, or music are included; they are read from the player's installs at runtime.