diff --git a/src/main/java/sh/okx/rankup/commands/RanksCommand.java b/src/main/java/sh/okx/rankup/commands/RanksCommand.java
index ce15937..85b2bde 100644
--- a/src/main/java/sh/okx/rankup/commands/RanksCommand.java
+++ b/src/main/java/sh/okx/rankup/commands/RanksCommand.java
@@ -35,8 +35,8 @@ public class RanksCommand implements CommandExecutor {
         // helpful message to say there is a null rankup
         if (next == null) {
           plugin.getMessage(Message.INVALID_RANKUP).failIfEmpty().send(sender);
-          plugin.getLogger().severe("Rankup from " + rank.getName() + " to " + rank.getNext() +
-              " is defined but " + rank.getNext() + " does not exist.");
+          plugin.getLogger().severe("Rankup from " + rank.getName() + " to " + rank.getNext()
+              + " is defined but " + rank.getNext() + " does not exist.");
           return true;
         }
 
diff --git a/src/main/java/sh/okx/rankup/requirements/requirement/PlaytimeMinutesRequirement.java b/src/main/java/sh/okx/rankup/requirements/requirement/PlaytimeMinutesRequirement.java
index 9af9e6c..abdb83e 100644
--- a/src/main/java/sh/okx/rankup/requirements/requirement/PlaytimeMinutesRequirement.java
+++ b/src/main/java/sh/okx/rankup/requirements/requirement/PlaytimeMinutesRequirement.java
@@ -26,12 +26,12 @@ public class PlaytimeMinutesRequirement extends Requirement {
 
   @Override
   public boolean check(Player player) {
-    return player.getStatistic(playOneTick) / TICKS_PER_MINUTE >= getValueDouble();
+    return getRemaining(player) <= 0;
   }
 
   @Override
   public double getRemaining(Player player) {
-    return Math.max(0, getValueDouble() - (player.getStatistic(playOneTick) * TICKS_PER_MINUTE));
+    return Math.max(0, getValueDouble() - (player.getStatistic(playOneTick) / TICKS_PER_MINUTE));
   }
 
   @Override
diff --git a/src/main/java/sh/okx/rankup/requirements/requirement/WorldRequirement.java b/src/main/java/sh/okx/rankup/requirements/requirement/WorldRequirement.java
new file mode 100644
index 0000000..58a0dcd
--- /dev/null
+++ b/src/main/java/sh/okx/rankup/requirements/requirement/WorldRequirement.java
@@ -0,0 +1,35 @@
+package sh.okx.rankup.requirements.requirement;
+
+import org.bukkit.entity.Player;
+import sh.okx.rankup.Rankup;
+import sh.okx.rankup.requirements.Requirement;
+
+public class WorldRequirement extends Requirement {
+  public WorldRequirement(Rankup plugin) {
+    super(plugin, "world");
+  }
+
+  protected WorldRequirement(Requirement clone) {
+    super(clone);
+  }
+
+  @Override
+  public boolean check(Player player) {
+    for (String world : getValueString().split(" ")) {
+      if (player.getWorld().getName().equalsIgnoreCase(world)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  @Override
+  public double getRemaining(Player player) {
+    return check(player) ? 0 : 1;
+  }
+
+  @Override
+  public Requirement clone() {
+    return new WorldRequirement(this);
+  }
+}