The character select screen is a screen that allows you to (what else?) select a character. It is a narrative framing device that gives the reader a small influence on the order in which they will progress through the story. It was introduced in Act 6.
If a character cannot be selected, they will be grayed out, this being the "universally understood UI convention for nonclickability."
If a character is meant to be selectable, but the pages aren't done yet, an informative (and, in Ms. Paint's case, apologetic) message will be shown. The first, second, third, and fifth time this message featured Andrew Hussie and the fourth time it featured Ms. Paint. These messages are still visible on completed screens, and can be reached by right-clicking the flash and pressing "play" a few times.
Along with a, Act 6 Act 6 Intermission 1. The fourth select screen and those following are technically supposed to be part of the "same" selection in-universe, however due to Caliborn filling the Act 6 Act 6 cartridge with stardust two of the paths have been rendered unselectable each time from glitches and the comic's progression at these points is still linear.
The next character select screen wouldn't appear for over a thousand pages, one last gluttonous chomp at the free will pie before you all say goodbye., where the reader can choose between eight different conversations. The dancing Hussie figure that appeared on the unfinished choices is the same as the image from A6A5A2. While a series of fake and linear character select screens (starting ) were introduced later in A6A6I5, the was introduced shortly afterward,