There is not a standalone video game called "Leavening," but the word has appeared as part of puzzles and word association games. Most notably, "leavening" was featured in the popular daily word game "NYT Connections," where players sort words into themed categories. In this context, leavening was grouped with other words based on unique commonalities for that day's puzzle.
Additionally, there are educational activities and puzzles themed around leavening agents, mostly used for teaching concepts in classrooms rather than digital games. There is no evidence of a mainstream video or board game specifically titled "Leavening."
