Play every game everywhere always in your mind.
Here, which parts of speech is 'always'?

Always (adverb): 
English Meaning - Every time or all the time. 
Bangla Meaning - বারংবার; ক্রমাগত। 

Play every game everywhere always in your mind.
- এই বাক্যটিতে 'always' শব্দটি play (verb)- কে modify করছে। 
- আবার, 'always' is modifying the action of playing games, indicating that it should be done continuously or at all times in one's mind.
- আমরা জানি, adverb সর্বদা verb, adjective বা অন্য কোন adverb কে modify করে। 
- তাই, এখানে 'always' হচ্ছে adverb.