feat: add skip_first_dt flag to prevent timer jump on new puzzle start

README.md

@@ -42,6 +42,14 @@ The game should run fine in any terminal. If you want retro CRT effects, here ar
 - Windows: Windows Terminal (enable experimental "retro mode")
 - Linux: Rio (with CRT shader), Cool Retro Term
 
+## Resource Conscious
+In most game-states, the game will sleep until your next input, resulting in 0% CPU usage while idle.  
+![sc9.png](docs/sc9.png)
+
+Only during an active puzzle (timer running), the game runs at ~30 FPS, which results in some CPU usage.  
+![sc8.png](docs/sc8.png)
+
+
 ## Build/Run from source
 You may be inclined to not run binaries from the internet, and want to build from source instead.
 

src/binary_numbers.rs

@@ -542,6 +542,7 @@ pub struct BinaryNumbersPuzzle {
     guess_result: Option<GuessResult>,
     last_points_awarded: u32,
     stats_snapshot: Option<StatsSnapshot>,
+    skip_first_dt: bool, // Skip first dt to prevent timer jump when starting new puzzle
 }
 
 impl BinaryNumbersPuzzle {
@@ -585,6 +586,7 @@ impl BinaryNumbersPuzzle {
             guess_result,
             last_points_awarded,
             stats_snapshot: None,
+            skip_first_dt: true, // Skip first dt to prevent timer jump
         }
     }
 
@@ -608,6 +610,12 @@ impl BinaryNumbersPuzzle {
             return;
         }
 
+        // Skip first dt to prevent timer jump when starting new puzzle
+        if self.skip_first_dt {
+            self.skip_first_dt = false;
+            return;
+        }
+
         self.time_left = (self.time_left - dt).max(0.0);
 
         if self.time_left <= 0.0 {