ウィーアーピコピコハンマーズ!!!! (We Are Pico Pico Hammers!!!!) is a crossover collaboration track born from Project ONSOKU, a joint initiative between Sega's Sonic the Hedgehog franchise and Crypton's Hatsune Miku. Released as the second installment of the project, the song was composed, arranged, and written by cosMo＠暴走P (cosMo@Bousou-P), a prolific Vocaloid producer known for high-BPM, technically dense compositions such as "The Intense Voice of Hatsune Miku" (初音ミクの消失). The track features Miku Hatsune on vocals and runs at a brisk 202 BPM over a 2:22 runtime. The song's title, a romanized borrowing of "We Are Pico Pico Hammers!!!!", leans into Sonic iconography: "pico pico" is the Japanese onomatopoeia for the signature sound of collecting rings, while the hammer motif nods to both the chaotlc energy of the collaboration and the relentless, hammering rhythm of the composition. The lyrics directly name-drop Sonic, Tails, and Knuckles, framing the trio's adventure-filled weekend plans through Miku's energetic, first-person perspective. ウィーアーピコピコハンマーズ!!!! debuted simultaneously across two Sega rhythm-game families, maimai でらっくす CiRCLE and CHUNTHIM X-VERSE, on November 20, 2025, and later arrived on ONGEKI Re:Fresh on December 25, 2025. In maimai, the Expert chart was designed by Luxizhel (level 10+), while the MASTER chart, assigned to サファ太 (Safata), clocks in at level 13+ with 1,038 notes, making it a demanding full-course for experienced players. The jacket artwork and accompanying music video were produced by the creative duo ツツミヒデアキ and くるみつ.