Do Wonders have to be communal or can they be individual? The communal Wonders are more interactive but perhaps turn order can become an issue.
I totaly agree: turn order is become an issue, especialy with cheap wonder with a small number of steps.
That's exactly why I've made a special rules for my wonder (The Wonders are available only once the first Victory card is gained.). You can potentialy do the same thing if you want: it's a new landscape type so you create the rule aroud them.
This is my participation to the challenge :
(I've never post any image here so I hope it will work...)
Of what I saw, there isn't any special rules with the wonders but I've create my wonders with a common rule: The Wonders are available only once the first Victory card is gained.
Colossus
Each step cost 4 coins.
The wonder is complete when all step are build. One step per player have to be build in order to achieve the completion (4 step at 4 player, 6 steps at 6 players ect...). You can buy any number of steps during the game until the wonder is constructed.
Once the wonder is complete, the players who have the less number of step discard down to two cards and each player gain an Attack card or a Duchy from the supply for each steps they have built.
If there are no Attack cards in the Kingdom, gaining Duchies might actually hinder your deck depending on when the Wonder gets completed. Perhaps it should let you gain any card costing up to $5 per step you have built?
What happens if there is a tie, e.g. in a 3-player game each player builds one step? Do they all discard down to 2 cards or is everyone immune?
For your first note, we could have two posibilities:
1) The board "force" you to have a deck were gaining duchy is really bad and risk to break your strategy.
In this case, all player have the same "penality" but it's wierd that you've all build something that kill the balance of your own deck instead of just make it beter...
2) The board don't force you to have a deck were gaining duchy is really bad but you still have this type of deck.
Since you know the wonder at the start of the game, if you've create this type of deck and not your opponent (because in this case, see 1) ), that mean you've done it with full knowledge of the fact and, after all, you've also buy the step(s). So it mean that you prefer to break the balance of your own deck and spend 4 coins and one buy per step instead of just discarding 3 cards during one turn. That mean it's probalby not a great imbalance.
For your second note: If there is a tie, both palyer are the minority contributor. I gess it's the same the other Wonder in this thread. With great wall, for example, if in a 5-player game each one have build one step, they all became imune to attacks. Same in a 4 player game with hanging garden where each player could have bought 3 steps and all became the main contributor (or with 3 player and 4 step per player). I mean, I think...
Alright here's my first shot at one of these!
The idea is a communal Wonder that players would likely casually contribute to early and mid game(encouraging a diversity of buys), with the option of a sprint towards a VP explosion (or blocking of said explosion) late game with a bit of effort. Also might lead to some unique endgame considerations.
Each step requires a buy and its cost.
Great Ziggurat
Step costs: 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8
Step: Gain a card that costs the same as this step.
Completion: Each main contributor, starting with the player who completes the Wonder, takes turns removing a step token and gaining a card of that cost until no step tokens remain.
I was originally thinking maybe just one step at each price point (for a more reasonable reward) but I think this really helps balance it for player 2.
I don't know if it's intentional but if only one player is the main contributor, he gain 2 province, two Duchy and a lot of verry good card (and yes, also two copper but it's stil verry strong).
An other thing (and I think this one isn't intentional) but in a majoity of board, no one want to make the two first steps of this if they are forced to gain Copper.