In a detailed blog post, Balatro developer Local Thunk shared an in-depth look into the game's development process. Surprisingly, Local Thunk revealed that he consciously avoided playing other roguelike games during Balatro's development, with one notable exception: Slay the Spire.

Starting in December 2021, Local Thunk decided not to play any more roguelike games. He explained, "I want to be crystal clear here and say that this was not because I thought it would result in a better game, this was because making games is my hobby, releasing them and making money from them is not, so naively exploring roguelike design (and especially deckbuilder design, since I had never played one before) was part of the fun for me. I wanted to make mistakes, I wanted to reinvent the wheel, I didn’t want to borrow tried-and-true designs from existing games. That likely would have resulted in a more tight game but it would have defeated the purpose of what I love about making games."

However, a year and a half later, Local Thunk broke his rule once by downloading and playing Slay the Spire. He was particularly impressed, stating, "Holy shit, now that is a game." He initially played it to study controller implementation for card games but found himself thoroughly engaged. He noted, "I did this because I was having some troubles in my controller implementation and I wanted to see how they handled controller inputs for a card game but I ended up getting sucked in. Thank goodness I avoided playing it until now because I surely would have just copied their incredible design (intentionally or subconsciously)."

Local Thunk's post also includes interesting tidbits about the game's development. For instance, the working folder for Balatro was initially named "CardGame" and remained unchanged throughout development. The game was also known as "Joker Poker" during much of its development phase.

He also shared insights into several scrapped features, such as:

• "a version where the only way to upgrade anything is to upgrade the cards in your deck in a sort of pseudo-shop, and those cards can be upgraded multiple times (think like Super Auto Pets, pets have different XP/levels when combined, same idea)"
• "a separate currency for rerolls outside of %1quot;"
• "a ‘golden seal’ to be added to playing cards when you skip all blinds that returns that card to hand after it has been played"

An amusing anecdote revealed how Balatro ended up with 150 Jokers. Local Thunk mentioned a miscommunication with Playstack, the game's publisher: "I also had a meeting with Playstack [the publisher] this month [October 2023] where I described to them the final content in the game, including ‘120 Jokers’. Later that week I had another meeting with them, and someone mentioned something about 150 Jokers. I couldn’t remember if I accidentally said I was going to make 150 or if they misheard me, but either way I thought that 150 was a much better number so I added 30 more Jokers to the plan."

Local Thunk also shared the origin story of his developer name, "Local Thunk," which stems from a programming joke. He recounted, "My partner was learning to code in R at the time, and she asked me 'How do you name your variables?' I went on some rant about casing, using descriptive words, underscores, etc. She waits until I am finished and says 'I like to call mine thunk'. I thought that was just about the funniest thing I had ever heard. The way variables are declared in Lua is (sometimes) with the local keyword, thus local thunk was born! I wouldn’t choose this name for quite a while yet but this is the moment I looked back on when I was finally ready to create a developer handle online."

For more details on the making of Balatro, you can visit Local Thunk's blog. IGN has praised Balatro, giving it a 9/10 and describing it as "A deck-builder of endlessly satisfying proportions, it's the sort of fun that threatens to derail whole weekend plans as you stay awake far too late staring into the eyes of a jester tempting you in for just one more run."