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The Baldi's Basics Plus Development Build are builds of BB+ made in 2019. The development build has not been released to the public by mystaman12. Only some videos, screenshots, and kickstarter updates prove this is real.
March 2019#
The only footage of the March 2019 development build is a 4 minute video on mystaman12's channel that features:
- Fog event
- Subtitles (that were added in the "1102" build)
- The elevator (with the textures, animations, and sounds from the Kickstarter Demo)
- Shorter and thinner desks
- Notebook system from BB+
- Early fog sound effect
- Lockers
- Posters
- "what" from BB Classic
- The placeholder poster from the kickstarter demo
- Yellow double doors
- Elevator closed system (used in Floor 2 & 3 for BB+)
- Second floor
- Working end-of-level elevator system
May 2019#
The "507" build (aka "Field Trips and Angry Teachers" build) is the first build of the game (that we know of) that features:
- Baldi in action
- 8 notebooks
- Field trips
The only proof of this build is from the 7th status update of BB+, with footage being the only thing available.
June 2019#
Unimportant Screenshots#
The screenshots below have very small differences between it and the current version of BB+ 
Important Screenshots#
The screenshots below have very noticeable differences between it and the current version of BB+ 
The placeholder wall and placeholder poster texture is being used.
The placeholder wall, floor, and ceiling texture are being used. An old version of the notebook counter gui and the items gui are also shown. The old staminometer is also used.
This screenshot features the first of three weird benches.
This screenshot features a bench blocking a door(?) (second/three weird benches)
Probably the most unexplainable image out of all of these. The last of the weird benches and the last of the school screenshots.
Once the timer runs out on the camping field trip, the "You are a camping dude! You win these items! WOWOWOOWOWOWOWOW!!!!" text appears and three items will be shown in front of the player. One is the tree and others are distorted Baldi heads, but all of them are placeholders. The player will be brought back to the school after a few seconds later.