At each level, there are items that are numbers and indicate which level you are playing at.
In each of the missions of the game, you can find a number that resembles the number of the current stage:
1 mission – big number 1 on the pizza box;
2 mission – number 2 on the billboard next to Dante’s store;
3 mission – three enemies who died in the explosion of a motorcycle form the number 3 when falling;
4 mission – a flag in the shape of the number 4 hangs near the meeting point of Virgil and Arkham;
5 mission – after one of the enemies crashes into the wall, traces of blood remain on it in the form of the number 5;
Mission 6 – after the explosion of the rocket, a sign in the form of the number 6 remains on the ground;
mission 7 – when Dante falls from a headshot, a blood stain in the form of the number 7 remains on the floor;
8 mission – at the moment when Dante gets up and walks next to the columns, you can see the number 8 on the moon behind him;
9 mission – the number 9 can be seen on the clip left from the Lady;
10 mission – when Virgil beats Arkham, blood splashes on the book, freezing in the form of the number 10;
11 mission – after Arkham disappears, you can see a smeared blood stain in the form of the number 11;
Mission 12 – When Dante grabs the Haywire Neo-Generator, Jester rides off in what looks like the number 12.
13 mission – immediately after Virgil makes a sacrifice, the camera angle changes, and the number 13 can be seen on the column;
14 mission – the number 14 can be seen on the edge of the crevice where Virgil fell;
Mission 15 – when the video starts, the camera shows a door with strange symbols, to the right of it it is easy to see the number 15, made of wood;
Mission 16 – after Dante begins to change human form to demonic, he will start shooting: the flashes from the shots are shown as the number 16;
17 mission – when Arkham makes the stones move, in the lower left corner of the screen, two rocks add up to the number 17;
18 mission – when Dante moves through the portal to the demonic world, you can see a flying newspaper with the printed number 18;
19 mission – during the video, bookshelves are shown with empty places that form the number 19;
Mission 20 – After Lady shoots her father, the mist accumulates in the shape of the number 20.