 const int LEFT_PIN = A3;
 
 // Pins for outputs (shift registers / LEDs)
-const int LATCH_PIN = 8; // green
-const int CLOCK_PIN = 12; // yellow
-const int DATA_PIN = 11; // blue
+const int LATCH_PIN = 8; // Green wire
+const int CLOCK_PIN = 12; // Yellow wire
+const int DATA_PIN = 11; // Blue wire
 
 /* Initializes all connections and creates a new game. */
 void setup() {

    pinMode(CLOCK_PIN, OUTPUT);
    pinMode(DATA_PIN, OUTPUT);

    // Seed the PRNG with the read from an unconnected pin
    randomSeed(analogRead(A4));

    // Begin game

/* Randomly returns either 1 or 2. */
int randomTile() {
    return random(1, 3);
}

/* Randomly returns the index of a row or column. */
int randomIndex() {
    return random(0, 4);
}