For Beats Per Minute, Chase McMullen rated the album 82 out of 100, applauding Twice's "ability to crank out pop bliss with nearly superhuman speed" and the album's "irresistible eclecticism on display, with each and every track serving as a unique adventure into some different corner. Another English song, "Icon", is a "hard-hitting" and "sensual" [12] synth-pop track with elements of reggae-pop. On October 24, JYP Entertainment released a mockumentary-style trailer featuring Twice members dressed up as scientists at the "Twice Love Lab".

It features an acoustic guitar riff on top of a trap-based rhythm and violins that "channel the feeling of classical music that the song title suggests".Hours before the official release of Formula of Love: O+T=<3, the group went live on YouTube and V Live to discuss the making-of the album. The track “Candy” was performed on TWICE’s 6th Anniversary celebration H6ME PARTY with 6NCE, on October 29, 2021, before its official release. A. (Fall In Love Again)", written by Nayeon, is a dance-pop and disco-pop track that explores the conflict of a relationship with no future.

Like Ooh-Ahh" • " Cheer Up" • " TT" • " Knock Knock" • " Signal" • " Likey" • " Heart Shaker" • What Is Love? On October 1, 2021, TWICE revealed at the end of the music video for " The Feels" that they would release their third full-length album in November. The fifth track, "Real You", written by Jihyo, is a disco-pop song characterized by a bouncy rhythm and "catchy" bass line on top of a "trendy" funky sound.South China Morning Post 's Tamar Herman noted that "throughout it all, [the album] is a groovy, bouncy addition that feels true to the group while still trying new things. TWICE [Formula of Love: O+T=<3]" [The Ultimate Recipe, Finally Found – TWICE [Formula of Love: O+T=<3]]. The fourth track "Cruel", written by Dahyun, is a fast-paced song with lyrics about "turning the tables on someone while still maintaining innocence".

Jihyo noted that the song is about "asking for truthfulness and sincerity from a person who is full of his/herself and doesn't realize what pure love is". It was in perfect condition and I got lots of extra post cards and really nice pulls, 10/10 would recommend!

In the United States, four limited digital editions were released on November 17 and 18, with digitally signed cover arts. Moreover, on other Billboard charts, the album peaked at numbers 7, 2, and 1 on Tastemakers, [48] Top Album Sales, [49] and World Albums, [50] respectively.