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Thursday 28 December 2017 at 22:11
my opinion (I own both games): If I were set on doing the trade, they would need to add cash to the deal (amount depends on game conditions)
that being said, GB is a fun game (and one of the most popular in our house) but I would not have traded my TZ for it. YMMV
Source: http://pinside.com/pinball/forum/topic/is-is-trading-a-twilght-zone-for-a-ghost-buster-premium-a-good-trade#post-4146591