Intcraft Anniversary, commonly known as I40.5 or IA, was a 1 week event server that took place during spring 2025. It was done primarily to celebrate Intcraft's ten year anniversary as well as give something people could play while waiting for I41 (yet to be announced as of this time). This makes the server more comparable to something such as pepecraft, epochcraft, or even wojcraft than an official iteration. It was developed by ADM8 and Jannied by Voth.

The main theme of IA was that it took place in the 1600s using chien's world map. The lore for the server suggested that demons were messing with the timeline, with various portals appearing on the world that players could use to visit past iterations. Many players found these time travel events exciting, as the ability to explore the past as well as try to extract with the loot they gather from these old worlds without dying made for an exhilarating adventure. These events all culminated in a portal to I34 opening, where the aforementioned demons were all slain by Airpiglet, wielding the “hero sword”, an enchanted sword presumably made with materials found in the portal worlds.

Another quirk of note for the server was in its use of towny, a plugin that hasn't been seen on intcraft since before I32 (almost 5 years ago!). Many players had struggled to adjust to the plugin, some refusing to play due to it replacing nodes on the server. A few issues did appear with towny, most notably war not working for the first 5-10 minutes as towny needed a server restart to enable it. A few players found the use of towny a welcome change, noting it made meme raids much funner compared to having to attack random nodes in the middle of nowhere. However, a major complaint was the lack of a /t income system for the town, making resource gathering much harder on the players.

IA/I40.5 was a mixed success, as it featured much lower player counts than the previous server, I40. Despite this low player count, only peaking at around 30 people on at a time, the server was fairly active, with the server consistently remaining populated for a week, outlasting other iterations such as I37.

Another common complaint about the server were issues regarding unbalanced “meme weapons” that were either spawned in by staff or a consequence of items gotten from the event worlds and combined with anvils. While certain items such as enchantment tables were “banned”, making it harder to get high level enchants, players were able to still use already placed tables in the event worlds as well as combine enchanted armor from I15 and I31 to make protection 4 armor. This combined with janny spawned event weapons such as the excalibur, a diamond sword with sharpness 25 that gave speed to the user, broke a lot of the balancing for the iteration and generated large amounts of seethe from both sides of the war (depending on who captured the equipment at the time).