navigate large chasms that appear on different timelines. Object rooms As the player progresses through the level they obtain keys by killing certain enemies. These keys are used to unlock the various object rooms throughout each level. Within each object room the player must obtain one of the items ostensibly scattered by Biff. The rooms appear as locked doors in Part II and caves or various buildings in Part III. To retrieve the items Biff scattered, the player must participate in a mini-game within the object room involving collecting a certain number of stop watches in 60 seconds while avoiding enemies and obstacles such as cacti, quicksand and falling pellets. Puzzle rooms Puzzle rooms are hidden throughout each level and found in various drainage pipes and manholes. Each puzzle room contains the scrambled name of the object that belongs there. The player must unscramble the word and select the proper item from their inventory. Correctly choosing the item that belongs within the room reveals one section of a picture puzzle. However, if the player chooses the wrong item, the item is removed from their inventory and returned to the object room in which it was previously located, forcing the player to complete the challenge within that room to re-obtain the object. In Part III, puzzle rooms are located under rocks that the player must break open by jumping on them a few times. Time travel After finding the remote control to summon the DeLorean, players can time travel between 1955, 1985 and 2015. However, adequate fuel must be collected before being able to time travel using the DeLorean. Additionally, each time the player time travels a clone of Marty is created in that year which, when touched, will instantly kill the player. Some platforms are out of reach in certain areas which need to be accessed to progress through the level. A player can plant an acorn in 1955 and then revisit that same location in 1985 or 2015 where a full-grown tree appears, allowing the player to access the previously unattainable space. Reception Skyler Miller of AllGame acknowledged Back to the Future Part II & III had little to do with the source material and had nonsensical elements, it was "a decent Super Mario Bros. rip-off" with "reasonably tight" controls and "passable" graphics. GamePro, also comparing the game to Super Mario Bros., suggested its various arcade-style mini-game levels makes