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His uppercut is excellent in virtually all situations, just generally hits the mark. You might actually want to block the incoming HK and then try to freeze them before they recover. Make sure you time this correctly or the other person will be able to HK you first if they what you're going to do. It is sometimes a good idea to leave off the roundhouse part of that combo and then stick in a HK afterwards as a wake up, or even blocked it will do more damage than the comboed roundhouse.
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Against the female ninjas you cannot link a starter to combo midscreen, so this is a time specifically when the 5 hit combo is beneficial. Remember that his 6 hit ground combo does less damage on its own than his 5 hit, but off a jump punch or JK starter, the 6 hit combo does a tad more than the 5 hit. Sub-zero can be easily juggle to max potential by all characters who have good juggle combos, so that hurts him. You can eek out a little extra damage in the corner on his combos by putting in ducking LKs on everyone, but for example, Kabal can spin you for free after that, and the Robots can teleport uppercut you, so on Kabal, kara jab (cancel a LP with block) and try to bait a spin out of him, and then capitalize with a combo, and against the Robots you can stick in a standing LK after his combo to add 6% giving him a reasonable 40% off a freeze in or near the corner. Set up the best possible combos from these situations. Remember his freeze is very fast and catches character when ducking on occasion. In UMK3 his iceclone is relatively limited compared to that of MK3 since you cannot get the freeze effect from it if you are too close. Sub has some decent corner traps I will get into later, but overall his damage is low and requires some creativity to make up for it. Zoning is particularly important and this can be done with the ice clone and ice showers. When use to his fullest ability, he is an excellent counter character for Kabal, however, it requires a much patience and craftiness. Unmasked Sub-zero is considered a low tier character in the 20s, perhaps even last, but there is a a certain level of effort behind this generally defensive character that can make him into a beast.
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Ultimate Mortal Kombat 3 Sub-Zero Strategy Guide
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