Update _redirects

Author: shiffman

static/_redirects

@@ -55,4 +55,6 @@
 /pose-classifier /tracks/ml5js-beginners-guide/ml5/7-posenet/2-pose-classifier 302!
 /raycasting /challenges/145-ray-casting-2d 302!
 /p5js /tracks/code-programming-with-p5-js 302!
-/processing /tracks/learning-processing 302!
+/processing /tracks/learning-processing 302!
+/genuary1 https://editor.p5js.org/codingtrain/sketches/vN8EEr59I 302!
+/particles https://thecodingtrain.com/challenges/78-simple-particle-system 302!