The first Microsoft Entertainment Pack for Windows lacked a number in its title since no sequels were planned initially. However, early box prints featured a bright red sticker reading "Now includes TET RIS for Windows!" with no other mention of Tetris on the packaging. This unique approach was due to ongoing licensing negotiations with Tetris at the time of initial print runs.

To avoid the risk of having to destroy boxes if the deal fell through, Microsoft produced boxes without any Tetris imagery or references. They prepared red stickers on standby, applying them only after the licensing agreement was finalized. Subsequent box runs incorporated Tetris directly into the artwork and rebranded the product as "Microsoft Entertainment Pack 1," referencing volumes 2 through 4.

Copies with the original Tetris sticker are considered ultra-rare collectibles, similar to special editions like the Windows 95 box with a shirtless baby hologram. The story highlights Microsoft's cautious approach to product launches during uncertain licensing negotiations.