One card might let you jump to the
directly adjacent tile, another may allow you to shift three tiles clockwise and yet another could let you investigate the houses on your left and right.
Houses and apartments score points, while factories and economic buildings can affect the score
of adjacent tiles.
The point is that the labels can be realised by making notches in the edges of one tile and adding protruding lugs to match them in
the adjacent tile.
The essential idea is an old one: the edges of prototiles can be «labelled» with marks or symbols, with the extra rule that
adjacent tiles must have matching labels along their common edges.
Grey tiles can not be clicked and must be flipped by getting
an adjacent tile to do the dirty work for you.
While Corrosion gives off a -2 to the spot He is on and a -1 to
all adjacent tiles.
Volt gives off a +2 voltage to the spot She is on and a +1 to
all adjacent tiles.