What? I can play the "no internet" game with internet?

Challenge files: Game.tar.gz

The time is 9:20 am. I just woke up and found out that idekCTF 2024 has a game in it! Time to try it out!

The challenge

We are given a game (above), and the problem states that the flag will be given to "players who reach a high enough score". Our goal will be doing just that.

Playing the game normally

Since you just need to reach a high enough score, we can play the game normally and reach it. But then why are you reading this? So...

Playing the game abnormally

By examining the challenge files, we see a spritesheet.json file, which is suspicious to say the least. So let's open that.

    "trex_running_0": {
        "x": 936,
        "y": 2,
        "width": 44,
        "height": 47,
        "collision": [
            {"x": 1, "y": 18, "width": 30, "height": 9},
            {"x": 1, "y": 24, "width": 29, "height": 5},
            {"x": 10, "y": 35, "width": 14, "height": 8},
            {"x": 22, "y": 0, "width": 18, "height": 16},
            {"x": 5, "y": 30, "width": 21, "height": 4},
            {"x": 9, "y": 34, "width": 15, "height": 4}
        ]
    },
    "trex_running_1": {
        "x": 980,
        "y": 2,
        "width": 44,
        "height": 47,
        "collision": [
            {"x": 1, "y": 18, "width": 30, "height": 9},
            {"x": 1, "y": 24, "width": 29, "height": 5},
            {"x": 10, "y": 35, "width": 14, "height": 8},
            {"x": 22, "y": 0, "width": 18, "height": 16},
            {"x": 5, "y": 30, "width": 21, "height": 4},
            {"x": 9, "y": 34, "width": 15, "height": 4}
        ]
    },

What's this? Game logic? Will making the collision array empty makes us invincible?

Nice! All that's left now is to wait for the flag to show itself.

Now excuse me, I am going to get myself some breakfast.