One additional thought just occurred to me which could effectively impact the spirit of the competition...and it is a situation that I dealt with on several occasions in the past. The problem is what if anything can be done about it.
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"Spoiler" participation.
While only eligible players would be ranked for the championship (i.e. one validated score per title), it is possible that a player skilled on one single title can put up an impossibly stellar top score, and minimal participation on the other nine. Having this happen across all ten titles would create "score clustering" for many lower-ranked scores.
Imagine (in theory) a title has a grandmaster-class player submit a validated 1M score while the next closest players all cluster between 100-200K, thus no more than 10-20% per title. Have this happen across all ten titles then out of a max 1000% the best one could hope for is an aggregate 200% or so...unless one of the top clustered players possesses one of those stellar out-of-reach scores.
"Score clustering" is to be expected in some but not all titles. The dynamics of certain titles make this inevitable. Time-based challenges limit point-pressing to a certain extent, but stage-based encourage extreme point-pressing without the time limit. Each suggested criteria carries with it a different risk-vs-reward outcome. Take "Galaxian"...in a 15 minute challenge do you go for boards or play slightly slower as non-stationary enemies are worth more points ? But in a stage-based threshold then you clearly maximize each stage and avoid shooting stationary enemies to the maximum extent possible while simultaneously going for max command ship points per stage. The chance of "clustering" is actually greater in a stage-based challenge in some cases depending on the dynamics of the title.
"Missile Command" is the opposite. In a time-based challenge the missiles/planes/smart bombs can only come out so quickly per stage no matter how efficiently you pick them off. Thus at the end of, say, 15 minutes most experts who lasted thru the end will be within just a few stages of one another, although the points will very in terms of efficiency along the way.
So the concerns of both "score clustering" on some titles exists as well as "spoiler scores", and specific to the latter, what to do about that as it is impossible to know in advance to some extent whether that is the intent of the submitter. The only solution I can come up with is to avoid title inclusions which carry with them the possibility of a runaway, nearly untouchable top score in the hands of an elite 1-3 players, in terms of disparity between all other players.
The Atari 2600 "Time Deca" from nearly 20 years ago educated me in the do's and don'ts of such an event. Score (time) clustering was extremely widespread on most titles, and the few that were whole-second-based ended up being the determining factors of the championship itself. Half of the titles had clustered results in a very spirited competition, but those were over-shadowed by the inclusion of "Breakout", "Superman" and other whole-second based titles...especially the ones with the least amount of seconds to complete the performance.
https://www.twingalaxies.com/showthr...-Final-Results
It was not included, but "Firefighter" which had a then-record of 7 seconds and a second-best record of 8 seconds is a major indication of how this failed...a mere one whole second in disparity was a huge percentage difference which would have dwarfed that of the titles that were dual-decimal-based in the deca event. As it was, "Breakout", "Superman" and "Adventure" alone ended up determining the final ranking this event.
The lesson to be learned from here is to craft a decathlon event where it won't come down to keeping pace on a few titles and focusing on a the few with the greatest point disparity potential.
That stated, thanks for all the opinions and nothing at all is set in stone, especially the "Final Ten" titles and the associated settings/criteria.