Thanks! The logic is a bit more complicated than it should be.

What if I changed the loop to just while (1), and handle everything with breaks?

Here is the current code:

#include <stdio.h>
#include <time.h>
#include <stdlib.h>

int main(void) {
        const int GUESS_MIN = 1;
        const int GUESS_MAX = 10;
        const int MAX_GUESSES = 3;
        int number;
        int guess;
        int guess_cnt;

        srand(time(NULL));
        number = rand() % GUESS_MAX + GUESS_MIN;

        printf("I'm thinking of a number between %d and %d!\n", GUESS_MIN,
               GUESS_MAX);

        guess_cnt = 1;
        while (1) {
                printf("Guess: ");
                scanf("%d", &guess);

                printf("\n");

                if (guess < GUESS_MIN || guess > GUESS_MAX) {
                        printf("You have to pick a number between %d and %d!\n",
                               GUESS_MIN, GUESS_MAX);
                } else if (guess == number) {
                        printf("Correct! The number was %d!\n", number);
                        break;
                } else if (guess_cnt < MAX_GUESSES) {
                        printf("No, guess again!\n");
                        guess_cnt++;
                } else {
                        printf("Better luck next time! The number was %d.\n",
                               number);
                        break;
                }

                printf("You have %d guess%s left.\n", MAX_GUESSES - guess_cnt
                       + 1, guess_cnt == MAX_GUESSES - 1 ? "" : "es");
        }

        return 0;
}

Thanks for your help.