Here is a video of a doom-alike in excel, explained by someone with a bird on his head. He's not clippy, but a real person with a bird on his head. [1]
Here is a video displaying a walk-through of the Excel easter egg that showed the Hall of Tortured Souls! [2]
Excel 98 had an Easter egg which was like Magic Carpet! If I recall correctly, you fly over a twisted purple and orange landscape while an obelisk emits the credits.
95 had the “Hall of Tortured Souls”—a 2.5D first-person walker—which was more Doomlike.
Here is a video of a doom-alike in excel, explained by someone with a bird on his head. He's not clippy, but a real person with a bird on his head. [1]
Here is a video displaying a walk-through of the Excel easter egg that showed the Hall of Tortured Souls! [2]
[1] https://www.youtube.com/watch?v=s105jek4WUI
[2] https://www.youtube.com/watch?v=WGqD-J_pRvs