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Tuesday 29 May 2018 at 23:38
Yeah, 8 ramps to start power ramps, 8 more to complete.
Trooper you get by knocking down the drops when "lock" is lit (or sweeping when orb is lit) then locking 3 balls in the orbits (green inserts)
Source: http://pinside.com/pinball/forum/topic/up-the-irons-the-iron-maiden-pinball-official-owners-club/page/24#post-4424508