player p block t white boring ▓▓▓▓▓ ▓▓▓▓▓ ▓t▓w▓ ▓▓▓▓▓ ▓▓▓▓▓ block w white interesting ▓▓▓▓▓▓▓▓▓ ▓▓ ▓▓ ▓▓ g G ▓▓ ▓▓ ▓▓ ▓▓ = p ▓▓ ▓▓ ▓▓ ▓▓▓▓▓▓ ▓▓ ▓▓▓ε▓▓▓▓▓ ▓▓▓▓▓▓▓▓▓ link G g green link H g green block g green interesting ▓ epsilon ε g green 4 1 --- 3 ▓H ▓▓ 2 block p magenta boring ▓▓▓▓▓ ▓ ▓ ▓ ▓▓▓▓▓ ▓▓▓▓▓ ▓▓▓▓▓ block 1 blue boring ▓ block 2 blue boring ▓ block 3 blue boring ▓ block 4 blue boring ▓