Game Boy World #049: Blodia [Tonkin House, 1989] & Pipe Dream [Bullet-Proof Software, 1989]

Two remarkably similar games that debuted for Game Boy in close proximity. We've had a few of those, huh? Here we have two games about laying down tracks ahead of some sort of advancing threat: Blodia (aka Timeball or Diablo) and Pipe Dream (aka Pipe Mania).