▁boxes ▁or ▁bomb s ▁( which ▁end ▁the ▁level ▁if ▁they ▁are ▁not ▁matched ▁before ▁they ▁go ▁off ), ▁multi - layer ed ▁m oss ▁blocks , ▁and ▁others . ▁Bo ost ers ▁can ▁be ▁earned ▁or ▁purchased ▁to ▁provide ▁assistance ▁during ▁levels . ▁ ▁Let ters ▁D ifferent ▁" special ▁letters " ▁can ▁be ▁formed ▁by ▁matching ▁a ▁combination ▁of ▁ 4 ▁( blue ) ▁or ▁ 5 ▁( green ) ▁letters . ▁The ▁blue ▁letter ▁expl odes ▁as ▁a ▁cross , ▁clear ing ▁ 4 ▁letters ▁around ▁the ▁colored ▁letter . ▁The ▁green ▁letter ▁expl odes ▁all ▁of ▁its ▁surrounding ▁ 8 ▁letters . ▁These ▁can ▁also ▁be ▁created ▁using ▁in - game ▁boost ers . ▁ ▁Some ▁letters ▁might ▁have ▁a ▁special ▁value , ▁that ▁will ▁give ▁the ▁user ▁more ▁points ▁are ▁marked ▁with ▁a ▁small ▁number ▁in ▁the ▁down - left ▁corner ▁of ▁the ▁tile . ▁User ▁might ▁also ▁get ▁“ Ill usion ” ▁letters . ▁These ▁are ▁pur ple ▁t iles ▁that ▁change ▁the ▁letter ▁they ▁are ▁after ▁each ▁new ▁round . ▁ ▁The ▁player ▁can ▁also ▁use ▁various ▁Bo ost ers ▁before ▁or ▁into ▁the ▁level ▁to ▁attempt ▁to ▁win ▁levels ▁more ▁easily ▁or ▁extend ▁play ▁after ▁a ▁lost ▁level ; ▁H int ▁shows ▁a ▁word , ▁Sh uffle ▁re order ▁all ▁of ▁the ▁letters ▁in ▁the ▁board , ▁W and ▁turns ▁a ▁letter ▁ind o ▁ ▁colored ▁letter ▁( bl u ▁or ▁green ), ▁Ham mer ▁cle ars ▁a ▁single ▁piece ▁from ▁the ▁board , ▁Rain