Program.cs

using System;
using System.Threading;

string[] runningAnimation =
[
	#region Frames
	// 0
	@"       " + '\n' +
	@"       " + '\n' +
	@"  __O  " + '\n' +
	@" / /\_," + '\n' +
	@"__/\   " + '\n' +
	@"    \  ",
	// 1
	@"       " + '\n' +
	@"       " + '\n' +
	@"   _O  " + '\n' +
	@"  |/|_ " + '\n' +
	@"  /\   " + '\n' +
	@" /  |  ",
	// 2
	@"       " + '\n' +
	@"       " + '\n' +
	@"    O  " + '\n' +
	@"  </L  " + '\n' +
	@"   \   " + '\n' +
	@"   /|  ",
	// 3
	@"       " + '\n' +
	@"       " + '\n' +
	@"   O   " + '\n' +
	@"   |_  " + '\n' +
	@"   |>  " + '\n' +
	@"  /|   ",
	// 4
	@"       " + '\n' +
	@"       " + '\n' +
	@"   O   " + '\n' +
	@"  <|L  " + '\n' +
	@"   |_  " + '\n' +
	@"   |/  ",
	// 5
	@"       " + '\n' +
	@"       " + '\n' +
	@"   O   " + '\n' +
	@"  L|L  " + '\n' +
	@"   |_  " + '\n' +
	@"  /  | ",
	// 6
	@"       " + '\n' +
	@"       " + '\n' +
	@"  _O   " + '\n' +
	@" | |L  " + '\n' +
	@"   /-- " + '\n' +
	@"  /   |",
	#endregion
];

string[] jumpingAnimation =
[
	#region Frames
	// 0
	@"       " + '\n' +
	@"       " + '\n' +
	@"   _O  " + '\n' +
	@"  |/|_ " + '\n' +
	@"  /\   " + '\n' +
	@" /  |  ",
	// 1
	@"       " + '\n' +
	@"       " + '\n' +
	@"       " + '\n' +
	@"    O  " + '\n' +
	@"  </L  " + '\n' +
	@"   /|  ",
	// 2
	@"       " + '\n' +
	@"    /O/" + '\n' +
	@"    /  " + '\n' +
	@"   //  " + '\n' +
	@"  //   " + '\n' +
	@"       ",
	// 3
	@"  __O__" + '\n' +
	@" /     " + '\n' +
	@"//     " + '\n' +
	@"       " + '\n' +
	@"       " + '\n' +
	@"       ",
	// 4
	@"  __   " + '\n' +
	@" // \O " + '\n' +
	@"     \\" + '\n' +
	@"       " + '\n' +
	@"       " + '\n' +
	@"       ",
	// 5
	@"  __   " + '\n' +
	@" //_O\ " + '\n' +
	@"       " + '\n' +
	@"       " + '\n' +
	@"       " + '\n' +
	@"       ",
	// 6
	@"  __\  " + '\n' +
	@" _O/   " + '\n' +
	@"       " + '\n' +
	@"       " + '\n' +
	@"       " + '\n' +
	@"       ",
	// 7
	@" \O\__ " + '\n' +
	@"     \\" + '\n' +
	@"       " + '\n' +
	@"       " + '\n' +
	@"       ",
	// 8
	@"       " + '\n' +
	@"       " + '\n' +
	@"   O   " + '\n' +
	@"  L|L  " + '\n' +
	@"   |_  " + '\n' +
	@"  /  | ",
	#endregion
];

string hurdleFrame =
	#region Frame
	@"  ___  " + '\n' +
	@" |   | " + '\n' +
	@" | . | ";
	#endregion

int position = 0;
int? runningFrame = 0;
int? jumpingFrame = null;

Console.CursorVisible = false;
if (OperatingSystem.IsWindows())
{
	Console.WindowWidth = 120;
	Console.WindowHeight = 20;
}
Console.Clear();
while (position < int.MaxValue)
{
	if (Console.KeyAvailable)
	{
		switch (Console.ReadKey(true).Key)
		{
			case ConsoleKey.Escape:
				Console.Clear();
				Console.Write("Hurdles was closed.");
				return;
			case ConsoleKey.UpArrow:
				if (!jumpingFrame.HasValue)
				{
					jumpingFrame = 0;
					runningFrame = null;
				}
				break;
		}
	}
	if (position >= 100 &&
		position % 50 is 0 &&
		(!jumpingFrame.HasValue ||
		!(2 <= jumpingFrame && jumpingFrame <= 7)))
	{
		Console.Clear();
		Console.Write("Game Over. Score " + position + ".");
		return;
	}
	string playerFrame =
		jumpingFrame.HasValue ? jumpingAnimation[jumpingFrame.Value] :
		runningAnimation[runningFrame!.Value];
	Console.SetCursorPosition(4, 10);
	Render(playerFrame, true);
	RenderHurdles(true);
	if (position % 50 is 5)
	{
		Console.SetCursorPosition(0, 13);
		Render(
			@"       " + '\n' +
			@"       " + '\n' +
			@"       ", true);
	}
	if (position % 50 < 3)
	{
		Console.SetCursorPosition(4, 10);
		Render(playerFrame, false);
		RenderHurdles(false);
	}
	else
	{
		RenderHurdles(false);
		Console.SetCursorPosition(4, 10);
		Render(playerFrame, false);
	}
	runningFrame = runningFrame.HasValue
		? (runningFrame + 1) % runningAnimation.Length
		: runningFrame;
	jumpingFrame = jumpingFrame.HasValue
		? jumpingFrame + 1
		: jumpingFrame;
	if (jumpingFrame >= jumpingAnimation.Length)
	{
		jumpingFrame = null;
		runningFrame = 2;
	}
	position++;
	Thread.Sleep(TimeSpan.FromMilliseconds(80));
}
Console.Clear();
Console.Write("You Win.");

void Render(string @string, bool renderSpace)
{
	int x = Console.CursorLeft;
	int y = Console.CursorTop;
	foreach (char c in @string)
		if (c is '\n') Console.SetCursorPosition(x, ++y);
		else if (c is not ' ' || renderSpace) Console.Write(c);
		else Console.SetCursorPosition(Console.CursorLeft + 1, Console.CursorTop);
}

void RenderHurdles(bool renderSpace)
{
	for (int i = 5; i < Console.WindowWidth - 5; i++)
	{
		if (position + i >= 100 && (position + i - 7) % 50 is 0)
		{
			Console.SetCursorPosition(i - 3, 13);
			Render(hurdleFrame, renderSpace);
		}
	}
}