Hunt for Smileys

Levelcodes:
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Level 1: PEEID
Level 2: EDOSI
Level 3: EMMUN
Level 4: SNIER
Level 5: PSTSI
Level 6: LEIZE
Level 7: EFUAL
Level 8: ETSNI
Level 9: IREGI
Level 10: NUHSN
Level 11: CSEGT
Level 12: DTFH
Level 13: NGISE
Level 14: DROWT
Level 15: RIWNE
Level 16: EFFOH
Level 17: WEISN
Level 18: UEDRI
Level 19: FEGHC
Level 20: NELLA