FROM PINBALL NEWS RULES:
Once you have spelled K-E-Y and shoot the chest, it opens to reveal Davy Jones' heart on a bed of gold doubloons some of which spell out H-E-A-R-T, the first letter of which is flashing.
You have to shoot the chest five more times to spell out H-E-A-R-T. When the ball is ejected, all the major shots are lit for jackpots. Jackpots start at 400K rising 25K each time and once lit they remain lit, even between balls.
Collect all, any or none of them and shoot the chest again to add another H-E-A-R-T letter and relight all the jackpot shots. You can just keep shooting the chest but you're missing out on some valuable jackpots on the ramps and lanes.
When you have completed all the H-E-A-R-T letters the chest is now lit for Heart Multiball.
Again all the major shots are flashing for jackpots. You need to keep shooting the chest to collect the Super Jackpot but its value is increased by collecting the lit jackpot shots. When you shoot a flashing shot it becomes solidly lit and no longer scores jackpots. When all jackpots are collected, the shots return to flashing and can be collected again. When you have shot the chest enough times to spell out H-E-A-R-T again the chest then scores the Super Jackpot.
This is worth 2M points or more and relights all the shots but perhaps most importantly gives you your compass feature light for Heart Super Jackpot. You can continue scoring jackpot and super jackpot scores until you are down to only one ball or fewer and of course you can combine them with the Tortuga Multiball for multiplied scores.