From personal experience I managed to nail the game without continuing in the space of six or seven days playing on and off. The time-frame is simply used as a best and worst case scenario. Becoming natural and efficient enough at the game towards becoming a Metal Slug XX Master will take HOURS of practice! The most common (and still rare) case of someone being able to nail this game in one, maybe a few goes, was if they were fresh off of completing Me tal Slug 3. On the very, VERY, rare (if at all) occasion where someone is able to pick up this game and complete the entire thing in one go without continuing, then carrying on to clean-up on the other achievements, this special individual could be looking at around a three hour completion. Some of you using this walkthrough will have noticed the time-frame for completing the game is set between three to 100 hours, this depends pretty much completely on your level of skill. It’s going to take many attempts to eventually make it through the game without continuing, so as you repeatedly come through each mission, be sure to do your best at remembering enemy spawns, attack patterns, power-up locations and level layouts.

Take your time and don’t be disappointed too much with failing. All seven missions will need to be completed without continuing, this means there are two chances for you to die before the pressure is really on.

How many levels are in metal slug 1