Since July 01, 2014, Architecture Contest events have become a staple of Megapolis. They have a timed duration in which the player can construct buildings, complete contracts, collect taxes, and house residents to acquire contest points toward placement on a leaderboard until the event is completed. After the timer reaches zero, the contest rewards can no longer be accessed and the special buildings are no more available. The lucky few on the top of the leaderboard gain unique buildings and rewards.
Since the inauguration on July 01, 2014 the contest was known as World Capitals then on April 24, 2015 it was referred by a new name: World Architecture (which relatively resembles structures from a particular country). The contest can also refer to a specific theme ("Winter", "Halloween") or to other ("Along the Silk Road"). On March 16, 2017, the regular contest arrangement was replaced by Modern Contests.
The Arms Race is a timed contest in which the player has 7 days to construct military buildings and prototypes and complete operations to accrue military influence points toward placement on a leaderboard comprising 30 random players who have similar/same military ranks. After the timer reaches zero, the contest rewards can no longer be accessed. The first Arms Race took place on June 02, 2016.
The Railroad Marathon is a timed contest in which the player has 7 days to collect passengers from stations and send them by external trains to acquire contest points toward placement on a leaderboard comprising 30 random players who have similar railroad developments. After the timer reaches zero, the contest rewards can no longer be accessed. The first Railroad Marathon took place on November 10, 2016.
Modern Contests are the replacement of previously ran Architectural Contests. The player is placed on a leaderboard against 30 random players around the same level, with the top 3 players gaining unique rewards. The contest plot is different in many ways. The contest is run from a central building which allows building special production and infrastructure buildings. There's a limit on how many of each type of buildings can be built. The buildings provide special items which can be collected to complete collections, which on selling will provide with contest points. There are multiple rewards for achieving various amount of points.