Classic Mode

Like in Smash Bros. Lawl (at least before the revamp, if it's different now), Classic Mode is a secondary game mode in Internet Fighter 21C where the character of the player's choice battles through 8 randomly generated characters, 2 rivals, and a final boss, similarly to the Mortal Kombat series's Arcade Mode or Street Fighter Alpha's single-player campaign.

The general order is:
 * 1) Random (low)
 * 2) Random (low)
 * 3) Random (low)
 * 4) Random (low)
 * 5) 1st Rival
 * 6) Bonus Stage (optional)
 * 7) Random (top)
 * 8) Random (top)
 * 9) Random (top)
 * 10) Random (top)
 * 11) 2nd Rival
 * 12) Segata Sanshiro (final boss)

Bonus Stage:
TBA

Final Boss:
After defeating the second rival, Segata Sanshiro will rise from the background and utilize the power in his hands in an attempt to defeat the player. After defeating Segata, the player's wish will be granted. That is, of course, as long as they promise to play Sega Saturn until their fingers break.