Sabotage, such as tripping competitors, throwing marbles or large obstacles in their paths, and the spreading of misinformation such as false route information, is common.
en.wikipedia.org Besides the various marbles and mosaics, gilt bronze was also used.
en.wikipedia.org Each slider has holes in different locations in it and, as each is moved, the holes can align and allow marbles to fall through.
en.wikipedia.org Razzle consists of a playing board with numbered holes, averaging 120, upon which eight marbles are spilled from a cup.
en.wikipedia.org For example, many metamorphic limestones, marbles, and calc-schists, with crystalline dolomites, contain silicate minerals such as mica, tremolite, diopside, scapolite, quartz and feldspar.
en.wikipedia.org