Maybe a v-pin? That way I would only own one physical machine but could play every one ever made whenever I wanted.
Personally, not a v-pin fan, but if you are limiting me in this hypothetical then I'm going to bend the rules a little.
If I can only have one pinball machine, does it ever break down? Do I need to find parts for it? or will it work forever? If I never had to fix it, I'd probably go with Haunted House. More Sq inches of pinball action than most other games I would imagine, unless you consider Hercules.
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