The 2021 Spring Thing Festival of Interactive Fiction features thirty-eight new interactive stories submitted by authors working across the spectrum of text games. Participants chose to place their games in either the Main Festival, where they are eligible for a Best In Show ribbon and prizes, or the Back Garden, with looser entry requirements allowing for more experimental or work-in-progress entries.

　　Main Festival

　　An Amical Bet, by Eve Cabanié - Quest Baggage, by Katherine Farmar - Inform/Glulx A Blank Page, by Edu Sánchez - Twine Copper Canyon, by Tony Pisculli - Ink Eleanor, by Rob - Windows Excalibur, by J. J. Guest, G. C. Baccaris and Duncan Bowsman - Twine Fish & Dagger, by grave snail games - Twine Hand of God, by Dana Freitas - Twine Heroes!, by Bellamy Briks - Quest Journey to Ultimate Fightdown!, by Havilah "mwahahavilah" McGinnis - Ink Lady Thalia and the Seraskier Sapphires, by E. Joyce and N. Cormier - Twine Mean Mother Trucker, by Bitter Karella - Inform/Glulx Medicum Veloctic, by Lawrence M Marable - Twine Miss No-Name, by Bellamy Briks - Twine Misty Hills, by Giuliano Roverato Martins Pereira - Twine Ned Nelson Really Needs a Job, by Eric Crepeau - Twine Perihelion, by Tim White - Twine Picton Murder Whodunnit, by Sia See - Strand Project Arcmör, by Donald Conrad and Peter M.J. Gross (as Bitterly Indifferent Studios) - Twine [PYG]MALION*, by C.J. - Twine Queenlash, by Kaemi Velatet - Twine The Secret of Nara, by Ralfe Rich - Twine Some Space, by rittermi - Twine Sovereign Citizens, by Laura Paul and Max Woodring - Twine A strange dream, by Anaïs Tn - Quest Sunny's Summer Vacation, by Lucas C. Wheeler - Twine Take the Dog Out, by Ell - Inform/Z Those Days, by George Larkwright - Twine The Weight of a Soul, by Chin Kee Yong - Inform/Glulx Wintervale, by Ethan Erh - Twine Back Garden

　　Blue November, by Lawrence Furnival - Twine Budacanta, by Alianora La Canta - Ren'Py Cycles (Excerpt), by Mike Marttila - Ink Eyewear Cleaner 2077: Demo, by Naomi Norbez - Twine Manikin Demo, by Rose Behar - Twine So I Was Short Of Cash And Took On A Quest, by Anssi Raisanen - Inform/Glulx Space Diner, by Marta and Alexej - Python Theatre of Spud, by D E Haynes - Python The authors of individual games retain all rights over their work. You do not have the right to redistribute, sell, or modify these games without permission from the work's original author.

　　The SpringThing2021.zip download contains all individual entries under 100 MB in size. Eyewear Cleaner 2077: Demo, Project Arcmör, and Eleanor can be downloaded individually. Budacanta can be downloaded in platform-specific versions from the festival website. Some entries may require online access to play.