Local Thunk Avoided Roguelikes in Balatro Dev, Except Slay the Spire

Balatro developer Local Thunk has shared an in-depth look at the game's development journey on his personal blog, revealing a unique approach to game creation. Throughout the development of Balatro, Local Thunk consciously avoided playing other roguelike games, with one notable exception.

As of December 2021, the anonymous developer decided to steer clear of roguelike games, including deckbuilders, which he had never played before. This choice was driven by his passion for game development as a hobby, rather than a professional endeavor. Local Thunk 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. His reaction was immediate and strong: "Holy shit," he wrote, "now **that** is a game." The initial reason for playing was to study controller implementation for card games, but he found himself captivated by the game. He remarked, "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 blog post offers numerous insights into the development process. Initially, the working folder for Balatro was simply named "CardGame," and it remained unchanged throughout development. The game's working title was "Joker Poker" for much of its development.

The developer also shared details about 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"

Local Thunk also recounted how Balatro ended up with 150 Jokers due to a miscommunication with the publisher, Playstack. He explained, "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."

Additionally, Local Thunk shared the origin of his developer name, 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 those interested in the full story behind Balatro's development, Local Thunk's blog is a treasure trove of insights. IGN has praised Balatro, awarding 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."