 These issues included network outages, problems with saving progress and difficulty connecting to the game's servers.As a result, some reviewers were unable to review the game, labeling the launch a "disaster" and the game "unplayably broken", urging players to avoid purchasing the game until the issues were resolved.Along with many of the cosmetic changes (such as up-to-date 3D graphics), "SimCity" uses the new GlassBox engine.