This is the robbers' thread. The cops' thread goes here.
Write a code that has the same number of bytes as the cop post and where the revealed characters are identical. The code must produce
1 in its initial state, and produce the numbers
2, 3 .. when single alterations are made.
The winner will be the robber that cracked the most posts.
MyLang, 9 bytes, 8 numbers (including link to answer), Cop's username.
Code that produces 1 - 8:
1: abc1efghi 2: abc2efghi 3: abc2efghij 4: kbc2efghij 5: kbc23fghij 6: kbc23fghi 7: kbc63fghi 8: kbc63fhi
Explanations are encouraged. The exact format of the robber post is optional.