Square Enix released several major updates to "patch up" these versions, adding back the original SNES graphics, the DS's extra content (like the Dimensional Vortex), and a proper controller/keyboard UI.
When Chrono Trigger was first released on the DS, Square Enix included notorious anti-piracy measures. If the game detected it was being played from a ROM on a flashcart (like an R4) rather than a retail cartridge, it would purposefully "hang" or freeze during the portal sequence at the Millennial Fair. Chrono Trigger Ds Rom Patched Up
Modern "patched up" ROMs use specific AP fixes that bypass the portal check, allowing players to move through time without the screen staying white or the music looping infinitely. Square Enix released several major updates to "patch