10 amazing coding challenge websites to test your coding skills

Coderbyte 

Beginner — Intermediate

They also provide courses in: Algorithms & Data Structures, Web Development, coding bootcamps.

---

Codewars

Beginner — Intermediate

---

CodeFights

Beginner — Intermediate

---

CodinGame

Beginner — Intermediate

---

TopCoder 

Intermediate — Advanced

They also offer sponsored competitions where you can win prizes

---

HackerRank

Intermediate — Advanced

---

LeetCode 

Intermediate — Advanced

They also provide: Mock Interview section for job interview preparation, coding contests and  articles

---

CodeChef 

Intermediate — Advanced

---

GeeksforGeeks 

Intermediate — Advanced

---

Codeforces

Advanced

---

Source: Daniel Borowski

Photo by Stanley Dai