First of all we apologize for this unbelievable mess in communication and misleading information that you have received on the modding of the map size. Like we have stated in the Reddit AMA and here on the forums, the map size in Cities: Skylines is 9 tiles which we know you can run with the supported hardware.
However after realizing the extent of this miscommunication and modders’ expectations we sat down with the team and discussed the map size further this morning. As we are not comfortable in growing the map size due to multiple issues it will cause there is not and will not be any official support for opening all 25 tiles.
But Cities: Skylines is all about modding and player control. Therefore we will hand an olive branch and open the code so that increasing the map size to a maximum of 25 tiles is possible through the modding API at launch. This is something the team wants to do against all reason so this is not official support.
The modders who wish to increase the map size realize that they do it solely at their own risk and will not expect any support from Colossal Order with the multiple issues this may cause. We at Colossal Order will do no testing what so ever regarding the increased map size.
On behalf of the Colossal dev team,
Mariinaps. Let’s move on to waiting for the game to release? Under 2 weeks to March 10th! We are super excited to hear what you think of the game!