Hi.
something like this :
set a int variable called 'index'
State 1 :
'Touch Event' (to register if touched)
State 2 : set this state as sequence (rightclick on a empty space in the action panel and select to enable)
'Int Add' + 1 (index)
'Int Compare' if less or equal / FINISH (leave Greater empty)
'Set Int Value' (index) set to 0
state 3
int switch (set 3 values, 0,1,2) and connect to 4a / 4b / 4c
state 4a / state 4b / state 4c (for each state, activate 1 and deactivate the other)
'Activate Game Object' Circle (true of false)
'Activate Game Object' Square (true of false)
'Activate Game Object' Triangle (true of false)
Transition back to State 1