As requested by Jumpyluff I made a version comparison between the paid versions and the free flash version.

tl;dr: Paid version and flash version are basically different games whether in terms of maps, towers or mechanics. The only difference between mobile and steam is that the thee premium items (bigger beacons, double cash, healthy bananas) are paid for using in game currency on steam but with real cash on mobile. Skip to bottom for board recommendation.

Full version:

Paid exclusive maps: Beginner: Checkers, Patch, Roswell Intermediate: Bloon of Clubs, Wattle Trees, Workshop Advanced: Long Range, Phase Portals, U-Turn Expert: Benguela, Double Double Cross

Flash exclusive maps: Beginner: Hill Giant, Pumpkin Patch Intermediate: Ice Flow, MOAB Desert, Snowflake Advanced: Downstream Expert: Spooky Castle

Maps that are shared but have difficulty inconsistency: Dune Sea is intermediate on paid but expert on flash Water Hazard is expert on paid but intermediate on flash

Paid exclusive towers: Bloonchipper, Heli Pilot, Monkey Engineer

The flash version has a lot of extra premium items purchaseable with real cash. These items are implemented on the paid versions through either the research lab or the fourth level of the specialist building. The flash premium items are equal or greater in power in comparison to the paid implementations. Furthermore because part of the premium items on the paid version are implemented through the specialist building only one can be active at a time with a disadvantage for another tower, whereas the flash version can have all active at once without any downside.

Board recommendations: Because of version difference there should be seperate boards for runs done on the flash version compared to the paid version.

I would recommend banning premium items, they trivialize higher difficulty settings and force mobile players to pay more (about 12 euros more) for an even playing field.

Suggestions as for the boards themselves: -Level leaderboards for all level and difficulty combinations -Beginner%, Intermediate%, Expert%, Advanced%, Extreme%: All levels with that difficulty in any order, again subcategories for all difficulty settings -All Special Missions; any order, self explanatory -All Maps: self explanatory, subcategorie for all difficulties again