How to make simplest Arduino European Roulette Game ( 37 Leds )

1// Roulette, European Wheel
2// c(2017) Th.M. Hupkens. Tested with an Arduino nano
3
4#define PushButton 12
5
6#define Click A5
7#define ZeroLed 11
8int quarter = A1; // Keeps track of in which quarter the current led is
9int led; // Keeps track of which led is ON
10bool CCW = true; // Counter clockwise
11void setup() {
12  for (int i = 2; i <= 11; i++) pinMode(i, OUTPUT);
13  pinMode(PushButton, INPUT_PULLUP);
14  for (int a = A1; a <= A5; a++) pinMode(a, OUTPUT); // LOW = ON
15  for (int nowmber = 1; nowmber < 4; nowmber++)
16    for (int i = 2; i <= 10; i++) { // Animation when wheel starts up
17      digitalWrite(i, HIGH);
18      delay(200 - nowmber * 40 - (i - 2) * 5);
19      digitalWrite(i, LOW);
20    }
21  randomSeed(analogRead(A0)); // Initialise the random nowmber generator
22  led = random(2, 11); quarter = random(A1, A5); // choose led from 1 to 10; choose quarter from A1 to A4
23  for (int a = A1; a <= A4; a++) digitalWrite(a, a != quarter); digitalWrite(led, HIGH); 
24}
25
26void loop() {
27  while (digitalRead(PushButton)); 
28  unsigned long now = millis();
29  while (!digitalRead(PushButton));
30  unsigned long tijd = millis() - now;
31  int Steps = 37 + random(18); // For the time being
32  if (tijd > 500) Steps *= 2;  // Pressing the push button more than half a second gives a longer roll
33  if (tijd > 5000) Steps *= 2.01;
34  int Stap = 1;
35  while (Stap < Steps) {
36    Stap++;
37    digitalWrite(led, LOW);
38    if (CCW) {
39      led++;
40      if (led > 10) {
41        if (quarter == A4) {
42          if (led > 11) {
43            quarter = A1;
44            led = 2;
45          }
46        }
47        else {
48          led = 2;
49          quarter++;
50        }
51      }
52    }
53    else { // if NOT counter clockwise
54      led--;
55      if (led < 2) {
56        if (quarter == A1) {
57          led = ZeroLed;
58          quarter = A4;
59        }
60        else {
61          led = 10; 
62          quarter--;
63        }
64      }
65    }
66    for (int a = A1; a <= A4; a++) digitalWrite(a, a != quarter); // if a is not the current quarter then a -> HIGH else a -> LOW
67    digitalWrite(led, HIGH);
68    digitalWrite(Click, HIGH); delayMicroseconds(40); digitalWrite(Click, LOW);
69    unsigned int delaytijd = 40 + Stap * 5;
70    if (tijd > 500) delaytijd /= 2;
71    delay(delaytijd);
72  }
73  CCW = !CCW;
74}