@haroldoanaconda You do get the blade somewhere between day 60 and day 80. A few days later, you can get the knight to slay the dragon and earn you 1000 coins and 25 happiness.
Tips for beating the nightmare with 4 hearts: Get DASH, HARDY, REGEN, and high (preferably maxed) levels in the main skills. Dash into a wall for a nice period of invincibility. Always move, so that you won't get hit by the attacks as often.
PoliTRICKS... This game does a very good job of demonstrating the "pendulum effect" in that through the changing of colors. It also (spoiler alert) demonstrates what happens when you try to go against the flow of the metaphorical pendulum at its maximum speed (when it reaches the center, or, in this case, "gray" point) and try to make it stop. The force already there is too much to stop; you just get pushed out of the way after making a futile attempt to stop the madness at the "gray" point.
I found an EXTREMELY intricate recreation of the tron lightcycle challenge at:
http://www.newgrounds.com/portal/view/556593
NOTE: Player 1 vs. CPU only, laggy turning caused by oversized pixels.
Using +1 bomb gives 1000 points if not blown up. Infinite points FTW!
+1 if you want this hint to stay visible. Happy times destroying the leaderboard!