From the Super Mario Wiki
Rolling Hills is the first world of Mario vs. Donkey Kong: Tipping Stars. The background of this world is a grassy plain with colorful hills, similar to those seen in the first worlds in the New Super Mario Bros. games. It introduces the first mechanic in the game, Red Girders. The only Minis that appear in this world are Mini Marios and Mini Peaches; Mini Marios debut in Level 1-1, while Mini Peaches debut in Level 1-4. Only one Shy Guy and two Circus Kongs can be encountered throughout Rolling Hills, as well as one Cursed Mini Mario in Level 1-8.
This world is very similar to Coaster Hills in Mario vs. Donkey Kong: Mini-Land Mayhem!, as both worlds feature an arrangement of the Super Mario Bros. 2 overworld theme, both end with Hills, both are grassland-themed, and both introduce two new Minis (Mini Mario and one other Mini toy introduced in the first Multi-Door level of their respective games).
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