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I would say the "Extra Mix" engine is probably not the correct name for the PSX version, seeing as the Extra Mix engine is, itself, derived from 4thMIX, whose engine APPEARS to have been used all the way back to 1st Mix (with specifics tweaked to meet the needs of the game releases), and STR!KE engine for the PS2 version is probably inaccurate since STR!KE uses a version of the DDRMAX era engine. — Preceding unsigned comment added by Travelsonic (talk • contribs) 20:05, 28 December 2017 (UTC)[reply]