This is Super Mario Bros: Time And Place. In this variation inspired by the "Time and Place" world from
http://www.braid-game.com/, time stands still when Mario stands still and speeds up when Mario speeds up. It took me ages to code this darned thing, so be sure you check out all of the strange new behaviours that result from this temporospatial anomaly. Like the balance-lift platforms, for instance.
Super Mario Bros. (JU) (PRG0) [!]
No-Intro Name: Super Mario Bros. (World)
(No-Intro version 20130731-235630)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7