World builder
The structure is now hierarchical: world, region, country, tier, division. It used to be a flat list in which "1. Liga" appeared six times, with the cups sitting next to it with no connection at all.
A world you built yourself now carries its own id. Before, the bundled world could mask it and start in its place. And a division now knows which division it is promoted into.
A world was limited to exactly two major competitions, because there were two fields for them in the savegame. Now there can be any number, attached to the world, a region or a country.
Three formats: regular knockout, double elimination with a losers bracket (you are out when you lose twice) and a round robin where everyone plays in one table.
The group stage is configurable: group size 3 to 8, how many go through, and whether there are return legs. Before, groups of four were hard-wired, and any other size put every single match on its own matchday: a group of six would have needed 15 instead of 5.
Other
Contract extensions now run to the duration you expect. Extending by 1 year now takes the contract to the end of next season.
The club name is now clickable everywhere and leads to a club profile, the counterpart to the player card.
Training camps now say what each location actually feeds. That the party island does almost nothing for fitness but three times as much for morale was written nowhere. Injured players gain nothing at all, and that is now stated before you book.
Goalkeeper kits were nearly always the same colour: 41 percent grey-blue, 28 percent pink, and two of the six colours never came up. It is now 14.4 to 19.6 percent per colour.
Kicking off a friendly did not start a match: it ran invisibly underneath the break week, and the continue button stayed locked afterwards.
At 125 percent scaling the end-of-season card hung 206 points below the window edge, at 150 percent it was 460.
If two cup rounds landed on the same matchday, the cup froze.
New window mode setting: native or borderless.
Tell me what you run into.