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Until about a year ago it was single-player with a tacked-on social component, but there's now co-op and a competitive ranking mode with prizes for the top 1% of players (and mostly irrelevant prizes for lower buckets).

If you stay out of the ranking dungeons it's hard to argue that a hack negatively impacts other players, but making the game easier does means you're less likely to pay them money to progress faster.

Imo this is what they should have expected by having game state on the client side.

Single player, although it probably leaderboards. More importantly it has pay-to-progress options, which these cheats would make redundant (which is probably what the company is angry about).

The 90's game was Quiz and Dragons by Capcom and it was arcade only.

That's what I was thinking of. Thanks!