This is the second Warp Zone you can reach from World 4-2. After the first elevator lift, there is a pit and three brick blocks above you. Jump around, and you'll find four hidden coin blocks under the three bricks. Use the hidden blocks you just uncovered to hit the first brick, which holds a Vine. The Vine leads to some bonus Coins and the warp pipe to World 6.

In Super Mario Bros., this Warp Zone lets you go to World 6, 7, or 8.

Like in Super Mario Bros., you can unlock hidden 1-Up Mushroom blocks in X-1 worlds by collecting enough coins in X-3 worlds in one life. This time around, however, not all X-1 worlds have the 1-Up blocks. Here are the remaining bonus 1-Ups and how to earn them:

• World 1-1: Already activated.
• World 3-1: Collect at least 21 (of 23) coins in World 1-3 or all 35 coins in World 2-3.
• World 5-1: Collect all 22 coins in World 3-3 or all 27 coins in World 4-3.
• World 7-1: Collect at least 23 (of 24) coins in World 5-3 or at least 24 (of 27) coins in World 6-3.

Note: Vs. SMB uses the same coin requirements from the original SMB, even though Worlds 5-3 and 6-3 were redesigned and ended up with more total coins. Interestingly, World 8-1 still has the hidden 1-Up block in its map data, but since the new World 7-3 has fewer coins (24) than the requirement (35), you'll never be able to activate the bonus during normal gameplay.