The main fun of Digimon Story Cyber Sleuthis raising up a small army of Digimon. Unlike the Pokémon games, where you're encouraged to focus on one core team, Cyber Sleuth wants you to experiment with Digivolving, De-Digivolving, and swapping out your party members for the critters in your farm.
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There is one thing standing in the way of your fun - you have a stat called Party Memory that limits how many Digimon you can use. The way it works is that every Digimon has a certain amount of memory it takes up. This number increases when it Digivolves. Once your Digimons' combined memory exceeds your Party Memory, you can no longer add to your party or even Digivolve a current member. You start with 20 Party Memory, which is barely enough to field a team of Rookie level Digimon.
Updated June 3, 2022 by Ryan Bamsey: With the sheer variety of Digimon available to hatch and raise in the Cyber Sleuth games, it's a pretty timeless classic with endless replayability - it's always fun to revisit and try out new team combinations. In that same vein, we've revisited this guide and rearranged the information into a handy table, guiding you towards every Party Memory-increasing item in the game in chronological order.
Memory UP and Memory UP DX are the only items in Cyber Sleuth that can increase your Party Memory. Unfortunately, you can't buy them or craft them. There are a limited number of Memory UPs available in the Cyber Sleuth story, and they're spread out through the various chapters. You'll typically receive one after beating a major boss fight, though there are a couple hidden in chests as well.
Use these items from the Digivice Menu. A
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